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The gauge (in American English or more commonly referred to as bore in British English) of a firearm is a unit of measurement used to express the inner diameter (bore diameter) and other necessary parameters to define in general a smoothbore barrel (compare to caliber, which defines a barrel with rifling and its cartridge).
A 12-gauge shotgun cartridge in a transparent plastic hull, allowing the contents to be seen. From left to right: brass, propellant, over-powder wad, shot wad, #8 birdshot, over-shot wad, and crimp. A shotgun cartridge, shotshell, or shell is a type of rimmed, cylindrical (straight-walled) ammunition used specifically in shotguns.
A numerically larger gauge indicates a smaller barrel: a 20-gauge (15.6 mm) shotgun requires more spheres to equal a pound; therefore, its barrel is smaller than the 12-gauge. This metric is used in Russia as "caliber number": e.g., "shotgun of the 12 caliber." The 16th caliber is known as "lordly" (Russian: барский).
20 gauge 28 gauge Italy: Franchi Sporting Purpose Automatic Shotgun 12: Luigi Franchi S.p.A. 12 gauge Italy: 1979 Franchi SPAS-15: Luigi Franchi S.p.A. 12 gauge Italy: 1986 Fosbery Pump Shotgun [1] George Vincent Fosbery United Kingdom: 1891 GEN-12: Taran Tactical: 12 gauge 20 gauge United States: 2024 H&R Ultraslug Hunter: H&R Firearms: 12 ...
The Spartan 310 has a walnut stock and fore-end, the shooter can select automatic ejectors or extractors, and a ventilated barrel rib. It uses screw-in SPR choke tubes.By default, the bottom barrel fires first, but the shooter can select the top barrel to fire first by pushing the trigger blade forward when the gun is loaded and closed. [4]
Shotgun conversion sleeves may be called subgauge inserts, subgauge tubes, or gauge reducers. Sleeves intended for rifle or handgun cartridges may have rifled barrels. Additional variations may allow centerfire weapons to fire rimfire ammunition and/or retain autoloading function with the smaller cartridge.
The gauge number is determined by the weight, in fractions of a pound, of a solid sphere of lead with a diameter equal to the inside diameter of the barrel. So, a 10-gauge shotgun nominally should have an inside diameter equal to that of a sphere made from one-tenth of a pound of lead. Each gauge has a set caliber.
For example, the barrel of a 12-gauge shotgun is equal to the diameter of a 1/12 of a pound lead ball (0.729 in) and a 20-gauge can fit a 1/20 pound lead ball (0.615 in). Using this method, a .410 bore is equivalent to a (hypothetical) 67-gauge, instead of the incorrectly labeled 36 gauge (0.506) in Europe and South America.