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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 centimetre (SI symbol: cm) is a unit of length in the metric system equal to 10 −2 metres ( 1 / 100 m = 0.01 m). To help compare different orders of magnitude , this section lists lengths between 10 −2 m and 10 −1 m (1 cm and 1 dm).
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.
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.
The 15 cm guns would have a caliber of 14.91 cm and would come in a two 25 caliber versions, a 30 caliber version, and a 35 caliber long version. [21] However, the first 15 cm L/30 gun that Krupp actually made had a caliber of 152.4 mm (i.e. 6"). Its consistent name could have been 15 cm MRK L/30.
5" is the caliber of this gun. The term "caliber" used here is the artillery caliber definition, and its value is equal to the bore diameter as measured from land to land. [5]: 81 Lands are the raised portions of the bore rifling, between the grooves. [5]: 81 (note: artillery caliber and small arms caliber are not the same).
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.