.17 HMR
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.17 Hornady Magnum Rimfire, commonly known as the .17 HMR, is a rimfire rifle cartridge developed by Hornady in 2002. It was developed by necking down a .22 Winchester Magnum Rimfire case to take a .17 caliber (4.5mm) projectile. Commonly loaded with a 17 grain projectile, it can deliver muzzle velocities in excess of 775 m/s.
17-grain (1.1 g) A Sellier and Bellot .17 HMR round with a light green plastic tip.
Left: .17 HMR, Right: .22 WMR
A .17 HMR round with a ballistic tip (left) compared with a .22 Long Rifle round (right)
A case of .17 HMR rounds with hollow points
Rifle
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A rifle is a long-barreled firearm designed for accurate shooting and higher stopping power, with a barrel that has a helical pattern of grooves (rifling) cut into the bore wall. In keeping with their focus on accuracy, rifles are typically designed to be held with both hands and braced firmly against the shooter's shoulder via a buttstock for stability during shooting. Rifles are used extensively in warfare, law enforcement, hunting and target shooting sports.
Names of parts of the M1 Garand rifle, World War II era, from US Army field manual
Rifling in a .35 Remington microgroove rifled barrel
Girdled bullet and twin rifle groove of the Brunswick rifle, mid-19th century