![]() One inch corresponds to 2.54 millimeters. Generally speaking, the caliber of pistol and rifle ammunition, excluding British ammo and with some exceptions, is expressed in the metric system, while ammo of American or British origin uses the imperial metric system, which provides, in our case, for measurement in inches, or rather in fractions. Let us also not forget that cartridges are an industrial product intended for the market therefore, commercial and marketing factors are also of great importance in their naming. The concept, simple as it is, is complicated by the different units of measurement adopted over the years and by habits, often linked to local military and hunting culture. The word “caliber” comes from the French calibre, itself taken from the Arabic qàlib meaning "shape, mold." In technical language referring to firearms, caliber is the measure of the diameter of a bullet. Weapons, the bullets and the propellant charge met only inside the barrel.
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