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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).
The more accurate setting options include ring gauges (also called master rings) and designated bore gauge setting equipment that utilize gauge blocks or other standards. When using a micrometer to set a dial bore gauge, the accuracy of the measurement will be 0.002 inches or 0.0508 millimeters.
Light field gun 76.2 mm 3 inch 15- pounder (multiple types) Field gun 76.2 mm 3 inch Ordnance QF 17- pounder: Anti-tank gun 76.2 mm 3 inch Ordnance QF 18- pounder: Field gun 83.8 mm 3.3 inch Ordnance QF 20-pounder: Tank gun 83.8 mm 3.3 inch Ordnance QF 25-pounder: Gun-howitzer 87.6 mm 3.45 inch Ordnance QF 32-pounder: Tank gun 94 mm 3.7 inch ...
For two reasons, canister shot fired from the 3-inch rifle was less effective than canister fired from a 12-pounder Napoleon or a M1841 12-pounder howitzer. First, its 3-inch bore was narrower than the 12-pounder's bore and could fire fewer canister balls. Second, the rifling of the barrel caused the canister to be thrown in an irregular pattern.
Chamber illustration indicating the various sections of a typical rifle chamber. The freebore is the cyan colored section just ahead of the neck. In firearms, freebore (also free-bore, free bore, or throat) is the portion of the gun barrel between the chamber and the rifled section of the barrel bore. The freebore is located just forward of the ...
The bore cross section areas "Q" used in the calculations were taken from the appropriate C.I.P. data sheets. The intermediate cartridges .30 Carbine , 7.92×33mm Kurz , 7.62×39mm , 7.62×45mm , 5.45×39mm , .223 Remington / 5.56×45mm NATO and 5.8×42mm stand out as having relatively low sub 8 O ratio's .
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A female worker boring out the barrel of a Lee-Enfield rifle during WWI. Gun barrels are usually made of some type of metal or metal alloy.However, during the late Tang dynasty, Chinese inventors discovered gunpowder, and used bamboo, which has a strong, naturally tubular stalk and is cheaper to obtain and process, as the first barrels in gunpowder projectile weapons such as fire lances. [2]