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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.
2.75 inches (7.0 cm) Military use of combat shotguns through the 20th century has created a need for ammunition maximizing the combat effectiveness of such weapons within the limitations of international law . 12- gauge has been widely accepted as an appropriate bore diameter to provide an effective number of projectiles within an acceptable ...
The Birmingham gauge ranges from 5/0 or 00000, the lowest gauge number corresponding to the largest size of 0.500 inches (12.7 mm), to 36, the highest gauge number corresponding to the smallest size of 0.004 inches (0.10 mm). The increments between gauge sizes are not linear and vary. [2]
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 millimetre (SI symbol: mm) is a unit of length in the metric system equal to 10 −3 metres ( 1 / 1 000 m = 0.001 m). To help compare different orders of magnitude, this section lists lengths between 10 −3 m and 10 −2 m (1 mm and 1 cm). 1.0 mm – 1/1,000 of a meter; 1.0 mm – 0.03937 inches or 5/127 (exactly)
While the bore diameter of 0.4880 in (12.40 mm) is consistent with other firearms which fire a 0.500 in (12.7 mm) diameter bullet, the groove diameter of 0.4983 in (12.66 mm) is an oddity as most firearms which fire a 0.500 in (12.7 mm) will have a groove diameter of equal to the diameter of the bullet.
Some Model 11-87 shotguns, especially those with barrels shorter than 26 inches (66 cm), or Magnum models, may have issues cycling light target and birdshot loads consistently. [ citation needed ] A 12 gauge model that accepts 3 + 1 ⁄ 2 -inch (8.9 cm) shells is marketed as the Super Magnum. [ 1 ]
Between each step the diameter, or thickness, diminishes by 10.557%, and the area and weight diminish by ~ 20%. None of the above systems of measurement is part of the metric system. The current British Standard for metallic materials including wire is BS 6722:1986, which is a solely metric standard, superseding 3737:1964, which used the SWG ...