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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 .
These can be used with either lead, bismuth, or steel shot. Older models had factory fixed chokes, and steel shot is not recommended for use with those. Some newer 12 gauge and 20 gauge Citori models have back-bored barrels. These are barrels with slightly larger bore diameters.
A 12-gauge shotgun, nominally 18.5 mm (0.73 in), can range from a tight 18 mm (0.71 in) to an extreme overbore of 20 mm (0.79 in). Some also claim an increased velocity with the overbored barrels, up to 15 m/s (49 ft/s), which is due to the larger swept volume of the overbored barrel.
Lead shot. Shot is a collective term for small spheres or pellets, often made of lead.These have been projected from slings since ancient times and were the original projectiles for shotguns and are still fired primarily from shotguns and grenade launchers, while they are less commonly used in riot guns.
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.
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 ...
Specs: 3-Shot, Takedown, 20 gauge only (2 1/2 & 2 3/4-inch), 2 shell detachable magazine. Weight 6 1/4 lbs, barrel, 25" with three interchangeable choke tubes, Modified, Full & Improved Cylinder. Plain one piece Monte Carlo pistol grip stock. Model 185D: The original model 185, produced from 1947 to 1950. Model 185D-A: Made in 1950 only.
Model 55 Hunter: The original model, the Model 55 Hunter, was produced from 1954 until 1964 in 12 gauge (1956-1964 in 20 gauge and 1961–1966 in 16 gauge). [4]Model 55 Goose Gun: The Goose Gun was a 12 gauge that was produced from 1962 until 1988 and it featured a 36" barrel with an overall length of 56¾" and weighed 8 lbs.
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