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Caliber, unit of measure |
| The term caliber or calibre designates the interior diameter of a tube or the exterior diameter of a wire or rod. The term most often appears with respect to firearms, as a measure of the inside diameter of the barrel in inches or in millimetres. In firearms, the caliber is the diameter of the inside of the barrel. In a rifled barrel the distance is measured between the lands.If the measurement is in inches then the caliber (abbreviated to cal) is quoted as a decimal of an inch, so a (smallbore) rifle with a diameter of 0.22 inch is a .22 cal ("twenty-two caliber"). The length of the barrel (especially for larger guns) is often quoted in calibers. Dimensions of rockets and missiles, particularly the location of the centre of pressure, are usually expressed in calibres, where one calibre is equal to the body diameter. |
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