Caliber (cal) 1
Caliber (cal) 1 : A unit used to express the bore of a gun. (The bore is the inside diameter of the gun barrel.) Traditionally, the diameter was stated in inches, so that ".22 caliber" referred to a pistol having a bore of 0.22 inches (5.588 mm). This usage is declining, because bore diameters of many guns are now stated directly in millimeters. "Caliber" is the American spelling; elsewhere the unit is often spelled "calibre." The decimal point is usually omitted when caliber measurements are spoken (as in "38-caliber"). Sometimes it is omitted when the measurement is written, but this is not a good practice
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