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In guns, particularly firearms, but not artillery, where a different definition may apply, caliber (or calibre; sometimes abbreviated as "cal") is the specified nominal internal diameter of the gun barrel bore – regardless of how or where the bore is measured and whether the finished bore matches that specification. [1]
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).
The British standard ordnance weights and measurements for the artillery were established by the Master General of Ordnance in 1764, and these were not altered until 1919, [citation needed] when the metric system was additionally introduced.
In artillery, caliber or calibre [nb 1] is the internal diameter of a gun barrel, or, by extension, a relative measure of the barrel length. Rifled barrels [ edit ]
Common rifle cartridges, from the largest .50 BMG to the smallest .22 Long Rifle with a $1 United States dollar bill in the background as a reference point.. This is a table of selected pistol/submachine gun and rifle/machine gun cartridges by common name.
12 cm kan M/94 (Bofors 12 cm naval gun L/45 model 1894) Sweden-Norway: 1890s - Cold War 120 mm (4.7 in) 12 cm kan M/11 (Bofors 12 cm naval gun L/45 model 1911) Sweden: World War I - Cold War 120 mm (4.7 in) 12 cm kan M/24 (Bofors 12 cm naval gun L/45 model 1924) Sweden: Interwar - Cold War 120 mm (4.7 in) Bofors 120 mm Automatic Gun L/50
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.
.22 caliber, or 5.6 mm, refers to a common firearms bore diameter of 0.22 inch (5.6 mm) in both rimfire and centerfire cartridges. Cartridges in this caliber include the very widely used .22 Long Rifle and .223 Remington/5.56×45mm NATO. .22 inch is also a popular air gun pellet caliber, second only to the ubiquitous .177 caliber.