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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.
A caliber conversion device is a device which can be used to non-permanently alter a firearm to allow it to fire a different cartridge than the one it was originally designed to fire. The different cartridge must be smaller in some dimensions than the original design cartridge, and since smaller cartridges are usually cheaper, the device allows ...
40 mm 1.575 Ordnance QF 3-pounder Vickers: Naval gun 47 mm 1.85 inch Ordnance QF 6-pounder: Anti-tank gun 57 mm 2.244 inch Ordnance BL 10-pounder Mountain gun: Mountain gun 69.8 mm 2.75 inch 12-pounder (multiple types) Light field gun 76.2 mm 3 inch Ordnance QF 13-pounder: Light field gun 76.2 mm 3 inch 15- pounder (multiple types) Field gun 76 ...
While modern firearms are generally referred to by the name of the cartridge the gun is chambered for, they are still categorized together based on bore diameter. [citation needed] For example, a firearm might be described as a "30 caliber rifle", which could accommodate any of a wide range of cartridges using a roughly 0.30 inches (7.6 mm) projectile; or as a "22 rimfire", referring to any ...
8 mm (.315+ caliber) 9 mm (.354+ caliber) 10 mm (.394+ caliber) 11 mm (.433+ caliber) 12 mm (.472+ caliber) 13 mm (.511+ caliber) See also. Table of handgun and rifle ...
United States Navy guns typically used rifling depth between one-half and one percent of caliber. Projectile bourrelet diameter specification was 0.015 inches (0.38 mm) less than land-to-land diameter with a minus manufacturing tolerance, so average clearance was about 0.012 inches (0.30 mm).
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Many countries and many U.S. states require a minimum of .24 caliber (6.1 mm) for hunting certain game species, such as deer. In such countries and states the 6×45mm would be legal for hunting as long as no further requirement regarding power, energy, or case length is stipulated.