Caliber Gun

A gun's caliber is determined by the diameter of the barrel and the size of the projectile used, measured in inches or millimeters. When the barrel diameter is given in inches, the abbreviation ''cal'' is used instead. For example, and rifle with a diameter of .22 inches is a .22 caliber gun. However, when spoken, the decimal is dropped, making it a 22 caliber rifle, or a two-two caliber. The caliber of weapons can also be given in millimeters, but they have the ''mm'' designation at the end.

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