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The length of the barrel (especially for larger guns) is often quoted in multiples of the caliber, used, for example, in US naval rifles 3 in (76 mm) or larger. [2] The effective length of the barrel (from breech to muzzle) is divided by the barrel diameter to give a dimensionless quantity.
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 parameter to define in general a smoothbore barrel (in difference of caliber what define a barrel with rifling and there cartridge).
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 ...
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 ...
10"/31 caliber gun United States: 1890s - 1921 254 mm (10.0 in) 10"/40 caliber gun Mark 3 United States: 1890 - 1921 254 mm (10.0 in) RML 10 inch 18 ton gun United Kingdom: 1868 - 1900s 254 mm (10.0 in) BL 10 inch Mk II - IV 32-caliber guns United Kingdom: 1885 - 1900s 254 mm (10.0 in) Cannone da 254/40 A Kingdom of Italy: 1893 - 1940s
When computing using this formula, Miller suggests several safe values that can be used for some of the more difficult to determine variables. For example, he states that a mach number of M {\displaystyle M} = 2.5 (roughly 2800 ft/sec, assuming standard conditions at sea level where 1 Mach is roughly 1116 ft/sec) is a safe value to use for ...
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The term caliber change in firearms refers to the process of permanently altering a firearm to allow it to fire a different cartridge than the one it previously fired. With a bolt action rifle, this is mostly done by reshaping the current chamber through machining it with a new reamer, or by replacing the barrel with a new barrel, which has a new cartridge chamber machined into it.