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| CATEGORIES ABOUT CALIBER | |
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| arabic words and phrases | |
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| units of length | |
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The term caliber or '''calibre''' designates the interior Diameter of a tube or the exterior diameter of a wire or rod. It comes from the Italian ''calibro'', itself from ''qālib'' (قالب), Arabic word for '' Mold ''. The term most often appears with respect to Firearm s, as a measure of the inside diameter of the Barrel in inches or hundredths of an inch, or in millimetres. FIREARMS In firearms, the caliber is the diameter of the inside of the barrel. In a Rifled barrel the distance is measured between opposing ''lands'' or ''grooves''; groove measurements are common in cartridge designations originating in the United States, while land measurements are more common elsewhere. When the barrel diameter is given in inches, the abbreviation "cal" is used in place of "inches". For example, a (smallbore) rifle with a diameter of 0.22 inch is a .22 cal, however the decimal point is generally dropped when spoken, making it ''"twenty-two calibre"''. Calibers of weapons can be referred to in metric in millimeters, as in a "caliber of eighty-eight millimetres" (88 mm) or "a hundred and five-millimetre caliber gun" (sometimes abbreviated as "105 mm gun"). While modern cartridges and Cartridge firearms are generally referred to by the cartridge name, they are still lumped together based on bore diameter; for example, a firearm might be described as a ''.30 caliber rifle'', which could be any of a wide range of cartridges using a roughly .30 inch projectile, or a ''.22 rimfire'', referring to any Rimfire cartridge using a .22 caliber projectile. Cartridge naming conventions
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