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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 .
left-to-right: .410 bore, 28 gauge, 20 gauge, and 12 gauge shotgun shells. The six most common shotgun gauges, in descending order of size, are the 10 gauge, 12 gauge, 16 gauge, 20 gauge, 28 gauge, and .410 bore. [7] By far the most popular is the 12 gauge, [7] particularly in the United States. [8]
The standard model holds five 2.75-inch (70 mm) or five 3-inch (76 mm) shells in the magazine and one in the chamber. The Model 500 is available in 12 gauge, 20 gauge, and .410 bore, with the 12 gauge being the most popular and having the most optional features available. A 16 gauge model was introduced in 1963 and later discontinued. [15] [16 ...
The .410 bore, for example, is readily fired in many .45 Colt firearms (like the Thompson Center Arms Contender), and that's firing a 67.5 gauge shell in a 51 gauge barrel, and the nearly 10% difference in bore diameter causes no problems. The difference between a 1 and 2 gauge bore, however, is 25%.
The 4, 8, 24, and 32 gauge guns are collector items. There are also some shotguns measured by diameter, rather than gauge. These are the .410 (10.4mm), .380 (9mm), and .22 (5.5mm); these are correctly called ".410 bore", not ".410-gauge". The .410 bore is the smallest shotgun size which is widely available commercially in the United States.
Most of these young hunters move up to a 20-gauge within a few years, and to 12-gauge shotguns and full-size hunting rifles by their late teens. Still, many who are particularly recoil-averse choose to stay with 20-gauge shotguns all their adult life, as it is a suitable gauge for many popular hunting uses.
12-gauge, 20-gauge 28, 26, 21, 21 and 20 in (710, 660, 530, 530 and 510 mm) Vent rib Rem Choke and fully rifled Bead and rifle sights, satin blue receiver finish, matte black synthetic stock finish. [13] Special Purpose Marine Magnum 12-gauge 18 + 1 ⁄ 2 in (470 mm) Cylinder choke Corrosion resistant utility gun with synthetic stock. [13]
For example, for a 12 gauge, the bore diameter of the barrel is nominally 18.5 mm (0.73 in), although different manufacturers do vary their as-manufactured bore from this diameter slightly. This is commonly called "overbore", when the as-built diameter exceeds the nominal actual diameter of 18.5 mm (0.73 in).