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The 20-gauge shotgun, also known as 20 bore, is a type of smoothbore shotgun. 20-gauge shotguns have a bore diameter of .615 in (15.6 mm), while the 12-gauge has a bore diameter of .729 in (18.5 mm). [ 2 ] 12-gauge and 20-gauge shotguns are the most popular gauges in the United States .
The M1 ammo crate held a total of 1,000 belted or linked rounds packed in 4 M1 ammo boxes and the later M1A1 ammo crate held a total of 1,000 belted or 1,100 linked rounds packed in M1A1 ammo boxes. There were two .50 M2 ammo boxes to a crate (for a total of 220 belted or 210 linked rounds) with a volume of 0.93 cubic feet.
The .410 bore is the smallest shotgun size which is widely available commercially in the United States. For size comparison purposes, the .410, when measured by gauge, would be around 67- or 68-gauge (it is 67.62-gauge), The .410 is often mistakenly assigned 36-gauge. The 36 gauge had a 0.506" bore. Reloading components are still available.
By far the most popular is the 12 gauge, [3] particularly in the United States. [4] The 20-gauge shotgun is the next most popular size, being favored by shooters uncomfortable with the weight and recoil of a 12-gauge gun, and is popular for upland game hunting. The next most popular sizes are the .410 bore and the 28 gauge.
32 gauge — .526 in (13.4 mm) 28 gauge — .550 in (14.0 mm) 24 gauge — .579 in (14.7 mm) 20 gauge — .615 in (15.6 mm) 16 gauge — .663 in (16.8 mm) 14 gauge — .693 in (17.6 mm) 12 gauge — .729 in (18.5 mm) 10 bore — .775 in (19.7 mm) 8 bore — .835 in (21.2 mm) 6 bore — .919 in (23.3 mm) 4 bore — 1.052 in (26.7 mm)
A Remington 870 12 gauge with sighted cylinder bore barrel suitable for Foster slugs and buckshot The "Foster slug", invented by Karl M. Foster in 1931, and patented in 1947 ( U.S. patent 2,414,863 ), is a type of shotgun slug designed to be fired through a smoothbore shotgun barrel, even though it commonly labeled as a "rifled" slug.
Many of these external-propellant caseless cartridges are also telescoped, with the bulk of the bullet held within the body of the cartridge, to cut down on cartridge length. A shorter cartridge cuts down on the distance the firearm's action must reciprocate to load a new round, which allows for higher cyclic rates and greater probability of ...
Home-defense and law enforcement shotguns are usually chambered for 12-gauge shells, providing maximum shot power and the use of a variety of projectiles such as buckshot, rubber, sandbag and slug shells, but 20-gauge (common in bird-hunting shotguns) or .410 (common in youth-size shotguns) are also available in defense-type shotgun models ...