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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 ...
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).
They then began to measure the effective length (and therefore range) of the weapon in calibers. These are a measure of the standardized length of the barrel versus the rifled bore of the barrel. In other words, a 12/45 is 12"×45= the length of the rifled bore of that gun in inches.
Infantry gun/AA gun 37 mm 1.457 inch Ordnance QF 2-pounder: Anti-tank gun 40 mm 1.575 inch Ordnance QF 2-pounder "pom pom" Anti-aircraft gun 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
Caliber/calibre: In small arms, the internal diameter of a firearm's barrel or a cartridge's bullet, usually expressed in millimeters or hundredths of an inch; in measuring rifled barrels this may be measured across the lands (.303 British) or grooves (.308 Winchester) or; a specific cartridge for which a firearm is chambered, such as .45 ACP or .357 Magnum.
It does find some use as a backup gun due to the generally small and easily concealable size of the weapons that chambered it (very few "mini pistols" are made in calibers larger than .380 ACP, and those few that are, are recent developments), and is popular on the civilian market as a personal defense round.
This is a list of firearm cartridges that have bullets in the 9 millimeters (0.35 in) to 9.99 millimeters (0.393 in) caliber range. Case length refers to the round case length. OAL refers to the overall length of the loaded round. All measurements are given in millimeters, followed by the equivalent in inches between parentheses.
Many pistol cartridges are in this caliber; the most common are: 7.62×25mm Tokarev, also known as 7.62 mm TT, is used in the Tokarev pistol, and many of the World War II Soviet submachine guns; 7.63×25mm Mauser, which was the basis for, and has nearly identical dimensions to, the Tokarev, but has different loading specifications.