Caliber W hen a bullet is submitted for comparison to a firearm, one of the first examinations conducted will be to determine the bullet's caliber .
Caliber is a term used to indicate the diameter of a bullet in hundredths of an inch.
The term caliber is of English origin and is used by ammunition and firearm manufacturers in the United States. Firearms and ammunition of European origin use the metric system and would refer to a 32 caliber bullet as an 7.65mm bullet. The caliber of the bullet is just the first class characteristic that must agree with the questioned firearm. The bullet must also be of the type found in cartridges that the firearm will fire. A cartridge is a single unit of ammunition consisting of the cartridge case, primer, and propellant with or without one or more projectiles.