1.
Rifle
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A rifle is a firearm designed to be fired from the shoulder, with a barrel that has a helical groove or pattern of grooves cut into the barrel walls. The raised areas of the rifling are called lands, which contact with the projectile. When the projectile leaves the barrel, this spin lends gyroscopic stability to the projectile and prevents tumbling and this allows the use of aerodynamically-efficient bullets and thus improves range and accuracy. The word rifle originally referred to the grooving, and a rifle was called a rifled gun, the word rifle is now used for any long hand-held aimed device activated by a trigger, such as Air rifles and the Personnel halting and stimulation response rifle. Rifles are used in warfare, hunting and shooting sports, formerly, rifles only fired a single projectile with each squeeze of the trigger. Modern rifles are capable of firing more than one round per trigger squeeze, some fire in an automatic mode. Thus, modern automatic rifles overlap to some extent in design, in fact, many light machine guns are adaptations of existing automatic rifle designs. A militarys light machine guns are chambered for the same caliber ammunition as its service rifles. Generally, the difference between a rifle and a machine gun comes down to weight, cooling system. Modern military rifles are fed by magazines, while machine guns are generally belt-fed, many machine guns allow the operator to quickly exchange barrels in order to prevent overheating, whereas rifles generally do not. Most machine guns fire from a bolt in order to reduce the danger of cook-off. Machine guns are often crewed by more than one soldier, the rifle is an individual weapon, the term rifle is sometimes used to describe larger crew-served rifled weapons firing explosive shells, for example, recoilless rifles. In many works of fiction a rifle refers to any weapon that has a stock and is shouldered before firing, the origins of rifling are difficult to trace, but some of the earliest practical experiments seem to have occurred in Europe during the 15th century. Archers had long realized that a twist added to the feathers of their arrows gave them greater accuracy. This might also have led to a increase in accuracy. Rifles were created as an improvement in the accuracy of smooth bore muskets, the black powder used in early muzzle-loading rifles quickly fouled the barrel, making loading slower and more difficult. Since musketeers could not afford to take the time to stop and clean their barrels in the middle of a battle, rifles were limited to use by sharpshooters, muskets were smoothbore, large caliber weapons using ball-shaped ammunition fired at relatively low velocity. Due to the high cost and great difficulty of manufacturing, and the need to load readily from the muzzle
2.
United States
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Forty-eight of the fifty states and the federal district are contiguous and located in North America between Canada and Mexico. The state of Alaska is in the northwest corner of North America, bordered by Canada to the east, the state of Hawaii is an archipelago in the mid-Pacific Ocean. The U. S. territories are scattered about the Pacific Ocean, the geography, climate and wildlife of the country are extremely diverse. At 3.8 million square miles and with over 324 million people, the United States is the worlds third- or fourth-largest country by area, third-largest by land area. It is one of the worlds most ethnically diverse and multicultural nations, paleo-Indians migrated from Asia to the North American mainland at least 15,000 years ago. European colonization began in the 16th century, the United States emerged from 13 British colonies along the East Coast. Numerous disputes between Great Britain and the following the Seven Years War led to the American Revolution. On July 4,1776, during the course of the American Revolutionary War, the war ended in 1783 with recognition of the independence of the United States by Great Britain, representing the first successful war of independence against a European power. The current constitution was adopted in 1788, after the Articles of Confederation, the first ten amendments, collectively named the Bill of Rights, were ratified in 1791 and designed to guarantee many fundamental civil liberties. During the second half of the 19th century, the American Civil War led to the end of slavery in the country. By the end of century, the United States extended into the Pacific Ocean. The Spanish–American War and World War I confirmed the status as a global military power. The end of the Cold War and the dissolution of the Soviet Union in 1991 left the United States as the sole superpower. The U. S. is a member of the United Nations, World Bank, International Monetary Fund, Organization of American States. The United States is a developed country, with the worlds largest economy by nominal GDP. It ranks highly in several measures of performance, including average wage, human development, per capita GDP. While the U. S. economy is considered post-industrial, characterized by the dominance of services and knowledge economy, the United States is a prominent political and cultural force internationally, and a leader in scientific research and technological innovations. In 1507, the German cartographer Martin Waldseemüller produced a map on which he named the lands of the Western Hemisphere America after the Italian explorer and cartographer Amerigo Vespucci
3.
United States Army Air Forces
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Each of these forces had a commanding general who reported directly to the Army Chief of Staff. S. Army to control its own installations and support personnel, the peak size of the AAF during the Second World War was over 2.4 million men and women in service and nearly 80,000 aircraft by 1944, and 783 domestic bases in December 1943. By V-E Day, the Army Air Forces had 1.25 million men stationed overseas, in its expansion and conduct of the war, the AAF became more than just an arm of the greater organization. By the end of World War II, the Army Air Forces had become virtually an independent service and this contrast between theory and fact is. fundamental to an understanding of the AAF. Gen. Billy Mitchell that led to his later court-martial, a strategy stressing precision bombing of industrial targets by heavily armed, long-range bombers emerged, formulated by the men who would become its leaders. Since 1920, control of units had resided with commanders of the corps areas. Both were created in 1933 when a conflict with Cuba seemed possible following a coup détat. Activation of GHQ Air Force represented a compromise between strategic airpower advocates and ground force commanders who demanded that the Air Corps mission remain tied to that of the land forces. GHQ Air Force organized combat groups administratively into a force of three wings deployed to the Atlantic, Pacific, and Gulf coasts but was small in comparison to European air forces. Corps area commanders continued to control over airfields and administration of personnel. The expected activation of Army General Headquarters prompted Army Chief of Staff George C. Marshall to request a study from Chief of the Air Corps Maj. Gen. Henry H. Arnold resulting on 5 October 1940 in a proposal for creation of an air staff, unification of the air arm under one commander, and equality with the ground and supply forces. Marshall implemented a compromise that the Air Corps found entirely inadequate, naming Arnold as acting Deputy Chief of Staff for Air but rejecting all organizational points of his proposal. GHQ Air Force instead was assigned to the control of Army General Headquarters, although the latter was a training and not an operational component, when it was activated in November 1940. A division of the GHQ Air Force into four air defense districts on 19 October 1940 was concurrent with the creation of air forces to defend Hawaii. The air districts were converted in March 1941 into numbered air forces with an organization of 54 groups. Marshall had come to the view that the air forces needed a simpler system, Arnold and Marshall agreed that the AAF would enjoy a general autonomy within the War Department until the end of the war, while its commanders would cease lobbying for independence. Marshall, a proponent of airpower, left understood that the Air Force would likely achieve its independence following the war
4.
World War II
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World War II, also known as the Second World War, was a global war that lasted from 1939 to 1945, although related conflicts began earlier. It involved the vast majority of the worlds countries—including all of the great powers—eventually forming two opposing alliances, the Allies and the Axis. It was the most widespread war in history, and directly involved more than 100 million people from over 30 countries. Marked by mass deaths of civilians, including the Holocaust and the bombing of industrial and population centres. These made World War II the deadliest conflict in human history, from late 1939 to early 1941, in a series of campaigns and treaties, Germany conquered or controlled much of continental Europe, and formed the Axis alliance with Italy and Japan. Under the Molotov–Ribbentrop Pact of August 1939, Germany and the Soviet Union partitioned and annexed territories of their European neighbours, Poland, Finland, Romania and the Baltic states. In December 1941, Japan attacked the United States and European colonies in the Pacific Ocean, and quickly conquered much of the Western Pacific. The Axis advance halted in 1942 when Japan lost the critical Battle of Midway, near Hawaii, in 1944, the Western Allies invaded German-occupied France, while the Soviet Union regained all of its territorial losses and invaded Germany and its allies. During 1944 and 1945 the Japanese suffered major reverses in mainland Asia in South Central China and Burma, while the Allies crippled the Japanese Navy, thus ended the war in Asia, cementing the total victory of the Allies. World War II altered the political alignment and social structure of the world, the United Nations was established to foster international co-operation and prevent future conflicts. The victorious great powers—the United States, the Soviet Union, China, the United Kingdom, the Soviet Union and the United States emerged as rival superpowers, setting the stage for the Cold War, which lasted for the next 46 years. Meanwhile, the influence of European great powers waned, while the decolonisation of Asia, most countries whose industries had been damaged moved towards economic recovery. Political integration, especially in Europe, emerged as an effort to end pre-war enmities, the start of the war in Europe is generally held to be 1 September 1939, beginning with the German invasion of Poland, Britain and France declared war on Germany two days later. The dates for the beginning of war in the Pacific include the start of the Second Sino-Japanese War on 7 July 1937, or even the Japanese invasion of Manchuria on 19 September 1931. Others follow the British historian A. J. P. Taylor, who held that the Sino-Japanese War and war in Europe and its colonies occurred simultaneously and this article uses the conventional dating. Other starting dates sometimes used for World War II include the Italian invasion of Abyssinia on 3 October 1935. The British historian Antony Beevor views the beginning of World War II as the Battles of Khalkhin Gol fought between Japan and the forces of Mongolia and the Soviet Union from May to September 1939, the exact date of the wars end is also not universally agreed upon. It was generally accepted at the time that the war ended with the armistice of 14 August 1945, rather than the formal surrender of Japan
5.
Cartridge (firearms)
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Military and commercial producers continue to pursue the goal of caseless ammunition. A cartridge without a bullet is called a blank, One that is completely inert is called a dummy. Some artillery ammunition uses the same concept as found in small arms. In other cases, the shell is separate from the propellant charge. In popular use, the bullet is often misused to refer to a complete cartridge. The cartridge case seals a firing chamber in all directions excepting the bore, a firing pin strikes the primer and ignites it. The primer compound deflagrates, it does not detonate, a jet of burning gas from the primer ignites the propellant. Gases from the burning powder pressurize and expand the case to seal it against the chamber wall and these propellant gases push on the bullet base. In response to pressure, the bullet will move in the path of least resistance which is down the bore of the barrel. After the bullet leaves the barrel, the pressure drops to atmospheric pressure. The case, which had been expanded by chamber pressure. This eases removal of the case from the chamber, brass is a commonly used case material because it is resistant to corrosion. A brass case head can be work-hardened to withstand the pressures of cartridges. The neck and body portion of a case is easily annealed to make the case ductile enough to allow reforming so that it can be reloaded many times. Steel is used in some plinking ammunition, as well as in military ammunition. Steel is less expensive than brass, but it is not feasible to reload, Military forces typically consider small arms cartridge cases to be disposable, one-time-use devices. However, case weight affects how much ammunition a soldier can carry, conversely, steel is more susceptible to contamination and damage so all such cases are varnished or otherwise sealed against the elements. One downside caused by the strength of steel in the neck of these cases is that propellant gas can blow back past the neck
6.
Bullet
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The word bullet is a firearm term. A bullet is a projectile expelled from the barrel of a firearm, the term is from Middle French and originated as the diminutive of the word boulle which means small ball. Bullets are made of a variety of materials and they are available singly as they would be used in muzzle loading and cap and ball firearms, as part of a paper cartridge, and much more commonly as a component of metallic cartridges. Bullets are made in a numbers of styles and constructions depending on how they will be used. Many bullets have specialized functions, such as hunting, target shooting, training, defense, a bullet is not a cartridge. In paper and metallic cartridges a bullet is one component of the cartridge, bullet sizes are expressed by their weight and diameter in both English and Metric measurement systems. For example.22 caliber 55 grain bullets or 5. 56mm 55 grain bullets are the same caliber, the word bullet is often used colloquially to refer to a cartridge, which is a combination of the bullet, paper or metallic case/shell, powder, and primer. This use of bullet, when cartridge is intended, leads to confusion when the components of a cartridge are discussed or intended, the bullets used in many cartridges are fired at a muzzle velocity faster than the speed of sound. Meaning they are supersonic and thus can travel a substantial distance, bullet speed through air depends on a number of factors such as barometric pressure, humidity, air temperature, and wind speed. Subsonic cartridges fire bullets slower than the speed of sound and so there is no sonic crack and this means that a subsonic cartridge such as.45 ACP can be effectively suppressed to be substantially quieter than a supersonic cartridge such as the.223 Remington. Bullets do not normally contain explosives, but damage the target by impact. The first use of gunpowder in Europe was recorded in 1247 and it had been used in China for hundreds of years. Later in 1364 hand cannon appeared, early projectiles were made of stone. Stone was used in cannon and hand cannon, in cannon it was eventually found that stone would not penetrate stone fortifications which gave rise to the use of heavier metals for the round projectiles. Hand cannon projectiles developed in a similar following the failure of stone from siege cannon. The first recorded instance of a ball from a hand cannon penetrating armor occurred in 1425. In this photograph of shot retrieved from the wreck of the Mary Rose which was sunk in 1545, the round shot are clearly of different sizes and some are stone while others are cast iron. The development of the hand culverin and matchlock arquebus brought about the use of cast lead balls as projectiles, bullet is derived from the French word boulette, which roughly means little ball
7.
Rifling
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In firearms, rifling consists of helical grooves in the internal surface of a guns barrel, which impart a spin to a projectile around its long axis. This spin serves to stabilize the projectile, improving its aerodynamic stability. Rifling is often described by its twist rate, which indicates the distance the rifling takes to complete one revolution, such as 1 turn in 10 inches. A shorter distance indicates a faster twist, meaning that for a given velocity the projectile will be rotating at a spin rate. Barrels intended for long, small-diameter bullets, such as the ultra-low-drag, 80-grain 0.223 inch bullets, extremely long projectiles such as flechettes may require high twist rates, these projectiles must be inherently stable, and are often fired from a smoothbore barrel. Muskets were smoothbore, large caliber weapons using ball-shaped ammunition fired at low velocity. Due to the high cost and great difficulty of manufacturing, and the need to load readily from the muzzle. Consequently, on firing the ball bounced off the sides of the barrel when fired, barrel rifling was invented in Augsburg, Germany in 1498. In 1520 August Kotter, an armourer of Nuremberg, Germany improved upon this work, though true rifling dates from the mid-16th century, it did not become commonplace until the nineteenth century. The most successful weapons using rifling with black powder were breech loaders such as the Queen Anne pistol, the grooves most commonly used in modern rifling have fairly sharp edges. More recently, polygonal rifling, a throwback to the earliest types of rifling, has become popular, polygonal barrels tend to have longer service lives because the reduction of the sharp edges of the land reduces erosion of the barrel. Supporters of polygonal rifling also claim higher velocities and greater accuracy, polygonal rifling is currently seen on pistols from CZ, Heckler & Koch, Glock, Tanfoglio, and Kahr Arms, as well as the Desert Eagle. Such guns have achieved significant increases in velocity and range. Examples include the South African G5 and the German PzH2000, gain-twist rifling begins with very little change in the projectiles angular momentum during the first few inches of bullet travel after ignition during the transition from chamber to throat. This enables the bullet to remain undisturbed and trued to the case mouth. After engaging the rifling the bullet is progressively subjected to accelerated angular momentum as burning powder propels it down the barrel. By only gradually increasing the rate, torque is spread along a much longer section of barrel. Gain-twist rifling was used as early as the American Civil War, colt Army and Navy revolvers both employed gain-twist rifling
8.
Primer (firearms)
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In firearm ballistics, the primer is a component of pistol, rifle, and shotgun rounds. Early primers were simply the same black powder used to fire the weapon and this external powder was connected though a tube in the barrel that led to the main charge. As powder wont burn when wet, this led to difficulty, or even the inability, modern primers are shock sensitive chemicals. In smaller weapons the primer is usually integrated into the rear of a cartridge, in larger weapons like cannon the primer is a separate component placed inside the barrel to the rear of the main propellant charge. The first step to firing a firearm of any sort is igniting the propellant, the earliest firearms were cannons, which were simple closed tubes. There was an aperture, the touchhole, drilled in the closed end of the tube. This hole was filled with finely ground powder, which was ignited with a hot ember or torch. With the advent of firearms, this became an undesirable way of firing a gun. The first attempt to make the process of firing a small arm easier was the matchlock, the matchlock incorporated a lock that was actuated by a trigger, originally called a tricker. The lock was a lever which pivoted when pulled. The match was a burning fuse made of plant fibers that were soaked in a solution of nitrates, charcoal, and sulfur. This slow-match was ignited before the gun was needed, and it would slowly burn, after the gun was loaded and the touchhole primed with powder, the burning tip of the match was positioned so that the lock would bring it into contact with the touchhole. To fire the gun, it was aimed and the trigger pulled and this brought the match down to the touchhole, igniting the powder. With careful attention the slow-burning match could be burning for long periods of time. The next revolution in technology was the wheel-lock. It used a spring-loaded, serrated steel wheel which rubbed against a piece of iron pyrite, a key was used to wind the wheel and put the spring under tension. Once tensioned, the wheel was held in place by a trigger, when the trigger was pulled, the serrated edge of the steel rubbed against the pyrite, generating sparks. These sparks were directed into a pan, called the flash pan, the flashpan usually was protected by a spring-loaded cover that would slide out of the way when the trigger was pulled, exposing the powder to the sparks
9.
Vermin
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Vermin are pests or nuisance animals, that spread diseases or destroy crops or livestock. Use of the term implies the need for extermination programs, since the term is defined in relation to human activities, which species are included vary from area to area and person to person. Varmint or varmit is an American-English colloquialism, particularly common to the American east and South-east within the bordering states of the vast Appalachia region. The term vermin is used to refer to a scope of organisms, including rodents, cockroaches, fleas, termites, lice, bed bugs. Birds which eat crops and fruit are an example. The American crow, is hated by farmers because of crop depredation. Pigeons, which have been introduced in urban environments, are also sometimes considered vermin. Some varieties of snakes and arachnids may also be referred to as vermin, vermin is also used as a term for vile people, an enemy of a state or nation, or certain ethnic groups that are considered subhuman. Species can develop into vermin if introduced into regions where they find living conditions. In such cases, humans often choose to fill the role of the predator to limit the danger to the environment, examples of vermin include goats on the Galápagos Islands, rabbits in Australia or cats on Prince Edward Islands. Rats, mice, and cockroaches are common urban and suburban vermin, hunting laws and definitions vary by province in Canada. Under Tudor vermin laws, many creatures were seen as competitors for the produce of the countryside, the declaration of the red kite as vermin led to its decline to the point of extirpation in the UK by the 20th century. However, the red kite is being reintroduced by the trans-location of breeding pairs from other parts of Europe, parasite Varmint hunting The dictionary definition of vermin at Wiktionary The New Brunswick Ministry of Natural Resources
10.
Game (hunting)
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Game or quarry is any animal hunted for sport or for food. The type and range of animals hunted for food varies in different parts of the world, in some countries, game is classified, including legal classification with respect to licences required, as either small game or large game. Game or quarry is any animal hunted for sport or for food, the term game arises in medieval hunting terminology by the late 13th century and is particular to English, from the generic meaning of Old English gamen joy, amusement, sport, merriment. Small game includes animals, such as rabbits, pheasants. Large game includes animals like deer and bear, big game is a term sometimes used interchangeably with large game although in other contexts it refers to large, typically African, mammals which are hunted mainly for trophies in safaris. The type and range of animals hunted for food varies in different parts of the world and this is influenced by climate, animal diversity, local taste and locally accepted views about what can or cannot be legitimately hunted. Sometimes a distinction is made between varieties and species of a particular animal, such as wild turkey and domestic turkey. Fish caught for sport are referred to as game fish, the flesh of the animal, when butchered for consumption is often described as having a gamey flavour. This difference in taste can be attributed to the diet of the animal. In some countries, game is classified, including legal classification with respect to licences required, a single small game licence may cover all small game species and be subject to yearly bag limits. Large game are often subject to individual licensing where a licence is required for each individual animal taken. In some parts of Africa, wild animals hunted for their meat are called bushmeat, see article for more detailed information on how this operates within the economy. In Africa, animals hunted for their pelts or ivory are sometimes referred to as the big game, also see the legal definition of game in Swaziland. South Africa has 62 species of gamebirds, including guineafowl, francolin, partridge, quail, sandgrouse, duck, geese, snipe, bustard, of the remaining 41 species,24 have shown an increase in numbers and distribution range in the last 25 years or so. The status of 14 species appears unchanged, with insufficient information being available for the three species. S. and Canada, deer are the most commonly hunted big game. Other game species include, In the PRC there is a special category called ye wei. In the UK game is defined in law by the Game Act 1831 and it is illegal to shoot game on Sundays or at night. Other that are hunted for food in the UK are specified under the Wildlife, the ban is generally considered voluntary on private lands, and few birds live away from RSPB or Forestry Commission land allegedly
11.
.22 Winchester Magnum Rimfire
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The.22 Winchester Magnum Rimfire, more commonly called.22 WMR.22 Magnum, or simply.22 Mag, is a rimfire cartridge. More recently, a high-quality 30gr Vmax cartridge from Hornady has been released and this exceeds 2200fps in a rifle and has a reputation for much greater consistency and accuracy than was previously attributed to this calibre. The.22 WMR was introduced in 1959 by Winchester, but was not used by Winchester until the Winchester Model 61 slide rifle could be chambered for it in 1960. By that time, Smith & Wesson and Ruger had revolvers for it, and Savage had come out with the Model 24 and since late 2012, the model 42, a modern update than the 24. It was the only successful rimfire cartridge introduced in the 20th Century, the.22 WMR uses a larger case than the more popular.22 Long Rifle, both in diameter and length. The.22 WMR case is a version of the older.22 WRF. The combination of powder and higher sustained pressures gives velocities over 2,000 feet per second from a rifle using a 30-grain bullet. Since the.22 WMR generally uses the same bullets as the.22 Long Rifle. If sighted in for maximum point blank range on a 3-inch high target and this makes the.22 WMR an effective short to medium range varmint rifle cartridge. The relatively quiet report and negligible recoil also make it a very pleasant round to shoot for extended periods. The.22 WMR can take down small game such as rabbits, groundhogs, prairie dogs, foxes, racoons and it first appeared in the Savage Model 24 combination rifle, followed by Winchesters own Model 61 pump-action rifle and Model 255 lever-action rifle. A number of single-shot and repeating rifles were offered in.22 WMR, the.22 WMR operates at pressures beyond what normal blowback actions typically handle, but the self-loading Jefferson Model 159 was introduced for the cartridge. Until the 1990s, most.22 WMR firearms were bolt-action rifles, in 1977-1985 Harrington & Richardson produced the first American-made semi-automatic.22 WMR. Revolvers in.22 WMR are made by Smith & Wesson, Taurus, North American Arms, Heritage Arms, semi-automatic pistols for this cartridge are produced by Kel-Tec, Grendel and AMT, the latter two now defunct. High-Standard produced various models and versions of their classic two-shot over/under derringer in both.22 WMR and.22 LR, the Argentine EDDA submachine gun uses the.22 WMR round. The.22 WMR is an enlarged, more powerful version of the much earlier.22 WRF, despite frequent claims to the contrary, it should not be used in any firearm except those specifically chambered for.22 WMR. The.22 WMR was for a time the most powerful rimfire round available, though the.22 WMR is more powerful than the.22 Long Rifle.22 WMR ammunition is not manufactured in as large a variety as.22 LR. It also is not as available in retail stores
12.
.17 HMR
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.17 Hornady Magnum Rimfire, commonly known as the.17 HMR, is a rimfire rifle cartridge developed by the ammunition company Hornady in 2002. It descended from the.22 Magnum by necking down the.22 Magnum case to take a.17 caliber projectile, commonly loaded with a 17 grain projectile, it can deliver muzzle velocities in excess of 775 m/s. The.17 HMR round is similar to rounds developed by dedicated rimfire wildcatters who worked to create a cartridge with an exceptionally flat trajectory. With 5mm diameter barrels and bullets being virtually unavailable at the time, the commercially available.17 caliber became their bullet of choice. The.22 Winchester Magnum Rimfire was the parent case, rather than 5mm RMR, because it was commonly available. The.17 caliber wildcats not only met, but far exceeded the 5 mm RMRs velocities, the accuracy of these cartridges was also quite good. However, the energy of the 5mm RMR is superior to both.22 WMR and.17 HMR, so there is still potential in the 5mm rimfire for wildcatters. Hornady, in conjunction with Marlin Firearms and Sturm, Ruger, with the.22 WMR case as the starting point, a simple barrel change was sufficient for most.22 WMR firearms to chamber the new cartridge. In 2002 the first rifles and ammunition began appearing on the market, while the ammunition was relatively expensive due to the high-performance.17 caliber bullets used, it was still cheaper than most centerfire ammunition. By 2004 CCI, Federal Cartridge and Remington had each introduced.17 HMR ammunition offerings. Cartridges for.17 HMR come with bullets that weigh 15. 5-grain, 17-grain, and 20-grain, and come in such as polymer tipped, hollow points, soft points. A growing number of companies offer.17 HMR ammunition, CCI Ammunition loads all of the.17 HMR ammunition for the CCI, Federal Cartridge, Hornady, and Remington brands. However, the ammunition is loaded with different bullets to different specifications, Ammunition is also available from Winchester, PMC and Sellier & Bellot. Citing safety concerns about the use in semi-automatic firearms, Remington issued a product safety warning. Higher velocity, 2350-2550fps compared to the popular ≈1255fps. 22LR High Velocity, Flatter trajectory Longer range As the round is faster there is less chance of ricochet due to bullet break up at shorter ranges More expensive. Overly destructive at close range for small game, faster flight, 2350-2550fps compared to the Hornady 2200fps 22Wmr 30gr rounds Flatter trajectory Longer range. The.17 HM2 is based on the.22 LR case necked down to.17 caliber using the bullet as the HMR. 4 mm caliber Table of handgun and rifle cartridges 4. 5×26mm MKR Varmint Als Field Testing the.17 HMR
13.
Rimfire ammunition
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Rimfire is a method of ignition for metallic firearm cartridges as well as the cartridges themselves. It is called rimfire because the pin of a gun strikes and crushes the bases rim to ignite the primer. Once the rim of the cartridge has been struck and the bullet discharged, while many other different cartridge priming methods have been tried since the 19th century, only rimfire technology and centerfire technology survive today in significant use. Frenchman Louis-Nicolas Flobert invented the first rimfire metallic cartridge in 1845 and his cartridge consisted of a percussion cap with a bullet attached to the top and the idea was to improve the safety of indoor shooting. In English-speaking countries, the Flobert cartridge corresponds to.22 BB, Rimfire cartridges are limited to low pressures because they require a thin case so that the firing pin can crush the rim and ignite the primer. Rimfire cartridges of.44 caliber up to.56 caliber were once common when black powder was used as a propellant, however, modern rimfire cartridges use smokeless powder which generates much higher pressures and tend to be of.22 caliber or smaller. Rimfire cartridges are typically inexpensive, primarily due to the inherent cost-efficiency of the ability to manufacture the cartridges in large lots, the price of metals used in the cartridges increased in 2002, the prices of the ammunition then further increased in 2012 possibly due to hoarding. The idea of placing a priming compound in the rim of the cartridge evolved from an 1831 patent, by 1845, this had evolved into the Flobert.22 BB Cap, in which the priming compound is distributed just inside the rim. The.22 BB Cap is essentially just a percussion cap with a round ball pressed in the front, intended for use in an indoor gallery target rifle, it used no gunpowder, but relied entirely on the priming compound for propulsion. Its velocities were very low, comparable to an airgun, the next rimfire cartridge was the.22 Short, developed for Smith & Wessons first revolver, in 1857, it used a longer rimfire case and 4 grains of black powder to fire a conical bullet. This led to the.22 Long, with the bullet weight as the short. This was followed by the.22 Extra Long with a longer than the.22 Long. The.22 Long Rifle is a.22 Long case loaded with the heavier Extra Long bullet intended for performance in the long barrel of a rifle. Larger rimfire calibers were used during the American Civil War in the Henry Repeater, the Spencer Repeater, the Ballard rifle and the Frank Wesson carbine. The early 21st century has seen a revival in interest in rimfire cartridges, a new and increasingly popular rimfire, the 17 HMR is based on a.22 WMR casing with a smaller formed neck which accepts a.17 bullet. The advantages of the 17 HMR over.22 WMR and other rimfire cartridges are its much flatter trajectory, the.17 HM2 is based on the.22 Long Rifle and offers similar performance advantages over its parent cartridge, at a significantly higher cost. While.17 HM2 sells for about four times the cost of.22 Long Rifle ammunition, it is significantly cheaper than most centerfire ammunition. A notable rimfire cartridge that is still in production in Europe and this cartridge can fire a small ball, but is primarily loaded with a small amount of shot, and used in smoothbore guns as a miniature shotgun, or garden gun
14.
Centerfire ammunition
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A centerfire cartridge is a cartridge with a primer located in the center of the cartridge case head. Unlike rimfire cartridges, the primer is a separate and replaceable component, centerfire cartridges have supplanted the rimfire variety in all but the smallest cartridge sizes. The stronger base of a cartridge is able to withstand higher pressures which in turn give a bullet greater velocity. Larger caliber rimfire cartridges require greater volumes of priming explosive than centerfire cartridges, reducing the amount of priming explosive would reduce the reliability of rimfire cartridge ignition, and increase the probability of misfire or dud cartridges. Economies of scale are achieved through interchangeable primers for a variety of centerfire cartridge calibers. The expensive individual brass cases can be reused after replacing the primer, gunpowder, the forward portion of some empty cases can be reformed for use as obsolete or wildcat cartridges with similar base configuration. Modern cartridges larger than.22 caliber are mostly centerfire, actions suitable for larger caliber rimfire cartridges declined in popularity until the demand for them no longer exceeded manufacturing costs, and they became obsolete. An early form of ammunition, without a percussion cap, was invented between 1808 and 1812 by Jean Samuel Pauly. This was also the first fully integrated cartridge, true centerfire ammunition was invented by the Frenchman Clement Pottet in 1829. However, Pottet would not perfect his design until 1855, the centerfire cartridge was improved by Benjamin Houllier, Gastinne Renette, Charles Lancaster, George Morse, Francois Schneider, Hiram Berdan and Edward Mounier Boxer. The identifying feature of centerfire ammunition is the primer which is a cup containing a primary explosive inserted into a recess in the center of the base of the cartridge. The firearm firing pin crushes this explosive between the cup and an anvil to produce hot gas and a shower of incandescent particles to ignite the powder charge, Berdan priming is less expensive to manufacture and is much more common in military-surplus ammunition made outside the United States. Berdan primers are named after their American inventor, Hiram Berdan of New York who invented his first variation of the Berdan primer and patented it on March 20,1866, in U. S. A small copper cylinder formed the shell of the cartridge, and this system worked well, allowing the option of installing a cap just before use of the propellant-loaded cartridge as well as permitting reloading the cartridge for reuse. S. Berdan primers have remained essentially the same functionally to the present day, Berdan primers are similar to the caps used in the caplock system, being small metal cups with pressure-sensitive explosive in them. Modern Berdan primers are pressed into the pocket of a Berdan-type cartridge case. Inside the primer pocket is a bump, the anvil, that rests against the center of the cup. Berdan cases are reusable, although the process is rather involved, the used primer must be removed, usually by hydraulic pressure or a pincer or lever that pulls the primer out of the bottom
15.
Handloading
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Handloading or reloading is the process of loading firearm cartridges or shotgun shells by assembling the individual components, rather than purchasing completely assembled, factory-loaded ammunition. Economy, increased accuracy, performance, commercial ammunition shortages, Reloading fired cartridge cases can save the shooter money, or provides the shooter with more, and higher quality, ammunition within a given budget. Besides economy, the ability to customize the performance of ammunition is a common goal, hunters may desire cartridges with specialized bullets or specific performance as regards bullet and velocity. Target shooters seek the best achievable accuracy, as well as the best shot-to-shot consistency, shotgunning enthusiasts can make specialty rounds not available in commercial inventories at any price. This technique also enables hunters to use the rifle and caliber to hunt a wider variety of game. Collectors of obsolete firearms who want to shoot those guns often must handload because appropriate cartridges or shotshells are no commercially produced. Handloaders can also create cartridges for which no equivalent exists - wildcat cartridges. As with any hobby, the enjoyment of the reloading process may be the most important benefit. Recurring shortages of ammunition are also reasons to reload cartridges. There are three aspects to ballistics, internal ballistics, external ballistics, and terminal ballistics, internal ballistics refers to things that happen inside the firearm during and after firing but before the bullet leaves the muzzle. Each cartridge reloaded can have each component carefully matched to the rest of the cartridges in the batch, brass cases can be matched by volume, weight, and concentricity, bullets by weight and design, powder charges by weight, type, case filling, and packing scheme. Where the most extreme accuracy is demanded, such as in rifle benchrest shooting, handloading is a prerequisite for success. The basic piece of equipment for handloading is the press, a press is a device that uses compound leverage to push the cases into the dies that perform the loading operations. Presses vary from simple, inexpensive single stage models, to complex progressive models that will eject a cartridge with each pull of a lever. Inexpensive tong tools have been used for reloading since the mid-19th century and they resembled a large pair of pliers and can be caliber specific or have interchangeable dies. Reloading presses are often categorized by the letter of the alphabet that they most resemble, O, C, the sturdiest presses, suitable for bullet swaging functions as well as for normal reloading die usage, are of the O type. Heavy steel completely encloses the single die on these presses, equally sturdy presses for all but bullet swaging use often resemble the letter C. Both steel and aluminum construction are seen with C presses, some users prefer C style presses over O presses, as there is more room to place bullets into cartridge mouths on C presses
16.
Varmint hunting
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Varmint hunting is the practice of hunting vermin, generally small mammals targeted as a means of pest control, rather than for food. Varminter may refer to a varmint hunter, or describe hunting equipment either specifically designed for, or suitable for varmint hunting, such as a varmint rifle. Varmint hunters may hunt to exterminate a nuisance animal from their own property, to collect a bounty offered by another landowner or the government, the definitive varmints are ground burrowing animals such as groundhogs and prairie dogs. These animals are small and difficult to approach closely, and hunting requires a long range. Remington 700 SPS, Has a 26 heavy contour barrel with standard features include a hinged floorplate magazine, sling swivel studs. Ruger No.1 Varminter single-shot rifle, equipped with scope base and rings for telescopic sight, while the trigger is factory set and locked, the trigger does include sear engagement and overtravel adjustment screws, which can be adjusted by a gunsmith. Savage Model 12 Varminter, includes adjustable trigger, and free floated extended heavy barrel, no iron sights, sierra Varminter line of bullets, light weight, hollow point and soft point bullets designed for high velocities, minimal penetration, and maximum expansion needed for varmints. Pest control Nuisance wildlife management Rat-catcher Vermin
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.223 Remington
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The.223 Remington is a rifle cartridge. The name is pronounced either two-twenty-three or two-two-three Remington. It is commercially loaded with 0.224 inch diameter jacketed bullets, with weights ranging from 40 to 85 grains, a 90 gr Sierra Matchking bullet is available for reloaders. The.223 Rem was first offered to the sporting market in December 1963 in the Remington 760 rifle. In 1964 the.223 Rem cartridge was adopted for use in the Colt M16 rifle which became a standard rifle of the U. S. Army. The military version of the uses a 55 gr full metal jacket boattail design and was designated M193. In 1980 NATO modified the.223 Remington into a new design which is designated 5. 56×45mm NATO type SS109, the cartridge and rifle were developed as one unit by Fairchild Industries, Remington Arms, and several engineers working toward a goal developed by U. S. Early development work begins in 1957, a project to create a Small Caliber High Velocity firearm is created. Eugene Stoner of Armalite is invited to scale down the AR-10 design, Winchester is also invited to participate. It was then known as the.224 Springfield, concurrently with the SCHV project Springfield armory is developing a 7.62 mm rifle. Harvey is ordered to cease all work on the SCHV to avoid any competition of resources, eugene Stoner of Armalite had been advised to produce a scaled down version of the 7.62 mm AR-10 design. In May 1957 Stoner gives a live demonstration of the prototype of the AR-15 for General Wyman. As a result, CONARC orders rifles to test, Stoner and Sierra Bullets Frank Snow begin work on the.222 Remington cartridge. Using a ballistic calculator they determine that a 55 grain bullet would have to be fired at 3, robert Hutton starts development of a powder load to reach the 3,300 fps goal. He uses DuPont IMR4198, IMR3031 and an Olin Powder to work up loads, testing is done with a Remington 722 rifle with a 22 Apex Barrel. During a public demonstration the round penetrates the US steel helmet as required. But testing shows chamber pressures to be excessively high, Stoner contacts both Winchester and Remington about increasing the case capacity. Remington creates a larger cartridge which is called the.222 Special which is loaded with DuPont IMR4475 powder,1958, During parallel testing of the T44E4 and the AR-15 the T44E4 experiences 16 failures per 1,000 rounds fired compared to 6.1 for the AR-15
18.
Muzzle energy
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Muzzle energy is the kinetic energy of a bullet as it is expelled from the muzzle of a firearm. It is often used as an indication of the destructive potential of a given firearm or load. The heavier the bullet and especially the faster it moves, the higher its muzzle energy, the general formula for the kinetic energy is E k =12 m v 2 where v is the velocity of the bullet m is the mass of the bullet. A subsonic variant of ammunition that would otherwise be supersonic has its velocity limited to less than the speed of sound, for ammunition with this limitation the muzzle energy is variable only with respect to the bullet mass m. In the SI system the above Ek will be in unit joule if the mass, m, is in kilogram, in United States engineering units, particular care must be taken to ensure that consistent units are used. Mass, m, is given in grains and the speed, v, in feet per second but kinetic energy. Most sporting arms publications within the United States report muzzle energies in foot-pound force.163 ft/s2 rather than the standard of 32.1739 ft/s2 is used. The formula therefore becomes E k =12 m v 2 × The bullet energy, remaining energy, down range energy, and impact energy of a projectile may also be calculated using the above formulas. It must be stressed that muzzle energy is dependent upon the previously listed. Also note that the energy is only an upper limit for how much energy is transmitted to the target. While the above list mentions some averages, there is variation in commercial ammunition. A180 grain bullet fired from.357 magnum handgun can achieve an energy of 580 foot-pounds. A110 grain bullet fired from the gun might only achieve 400 foot-pounds of muzzle energy. Some.45 Colt ammunition can produce 1,200 foot-pounds of muzzle energy, some jurisdictions stipulate minimum muzzle energies for hunting. In Germany airsoft guns with an energy of no more than 0.5 J are exempt from the gun law. Free recoil Muzzle velocity Power factor Edward F. Obert, Thermodynamics, Mc Graw-Hill encyclopedia of Science and Technology, volume ebe-eye and ice-lev, 9th Edition, Mc Graw-Hill,2002
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Winchester rifle
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Winchester rifle is a comprehensive term describing a series of lever-action repeating rifles manufactured by the Winchester Repeating Arms Company. Developed from the 1860 Henry rifle, Winchester rifles were among the earliest repeaters, the Model 1873 was particularly successful, being colloquially known as The Gun that Won the West. In 1848, Walter Hunt of New York patented his Volition Repeating Rifle incorporating a tubular magazine, the Hunt rifle fired what he called the Rocket Ball, an early form of caseless ammunition in which the powder charge was contained in the bullets hollow base. Horace Smith and Daniel Wesson of Norwich, Connecticut acquired the Jennings patent from Robbins & Lawrence and its largest stockholder was Oliver Winchester. Smiths cartridge, the.22 Short, would be introduced commercially in 1857 with the landmark Smith & Wesson Model 1 revolver and is manufactured today. Wesson had left Volcanic soon after it was formed and Smith followed eight months later, Volcanic moved to New Haven in 1856, but by the end of that year became insolvent. Oliver Winchester purchased the firms assets from the remaining stockholders. Benjamin Henry continued to work with Smiths cartridge concept, and perfected the much larger, Henry also supervised the redesign of the rifle to use the new ammunition, retaining only the general form of the breech mechanism and the tubular magazine. This became the Henry rifle of 1860, which was manufactured by the New Haven Arms Company, confederates called the Henry that damned Yankee rifle that they load on Sunday and shoot all week. After the war, Oliver Winchester renamed New Haven Arms the Winchester Repeating Arms Company, the company modified and improved the basic design of the Henry rifle, creating the first Winchester rifle, the Model 1866. It retained the.44 Henry cartridge, was built on a bronze-alloy frame, and had an improved magazine. In 1873 Winchester introduced the steel-framed Model 1873 chambering the more potent. 44-40 centerfire cartridge, in 1876, in a bid to compete with the powerful single-shot rifles of the time, Winchester brought out the Model 1876. The first Winchester rifle – the Winchester Model 1866 – was originally chambered for the rimfire.44 Henry. Nelson Kings improved patent remedied flaws in the Henry rifle by incorporating a loading gate on the side of the frame and integrating a round, france purchased 6,000 Model 1866 rifles along with 4.5 million.44 Henry cartridges during the Franco-Prussian War. The Ottoman Empire purchased 45,000 Model 1866 muskets and 5,000 carbines in 1870 and 1871, the Model 1866 compelled Russians to develop a new rifle, the Mosin–Nagant, after the war. The Swiss Army initially selected the Model 1866 to replace their existing single-shot Milbank-Amsler rifles, however, ensuing political pressure to adopt a domestic design resulted in the Vetterli Model 1867, a bolt-action design utilizing a copy of the Winchesters tubular magazine, being adopted instead. Due to public demand, the Model 1866 continued to be manufactured and sold until 1899, the Model 1873 was one of the most successful Winchester rifles of its day, with Winchester marketing it as The Gun that Won the West. Still an icon in the day, it was manufactured between 1873 and 1923
