Gauge (firearms)
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The gauge of a firearm is a unit of measurement used to express the inner diameter and other necessary parameters to define in general a smoothbore barrel.
From left to right; a .45 ACP cartridge, a .410 bore shotshell, a 20-gauge shotshell, and a 12-gauge shotshell
Portrait of Frederick Courteney Selous with his 4 bore single-shot Boer rifle and African hunting regalia, 1876
Left to right: .410 bore, 28-gauge, 20-gauge, and 12-gauge shotgun shells
Garden gun calibers: 9mm Flobert shot, 9mm Flobert shot, .22 Long Rifle shot, .22 Long Rifle, .22 Long Rifle shot, .22 CB Short, and 9mm Flobert BB cap
.410 bore
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The.410 bore is a small caliber shotgun, firing one of the smallest commonly available shotgun shells. A.410 bore shotgun loaded with shot shells is well suited for small game hunting and pest control
Gauge (firearms)
…in descending order of size, 10 gauge, 12 gauge, 16 gauge, 20 gauge, 24 gauge, 28 gauge, 32 gauge (sometimes called 14 millimeter or 32 bore), and .410 bore. By far, the most popular is the 12 gauge, followed by 20 gauge, particularly in the United States. Shotguns and shells exceeding 10 gauge, such as the…
Two .410 shells being loaded into a side-by-side double-barrel shotgun
.410-bore M-35 shotgun shells for M6 survival rifle with .22 long rifle for comparison
H. Koon "Snake Charmer" advertisement