A Rifle's Caliber
Rifles and handguns are measured in caliber. Caliber is a measurement of the diameter of the bullet or the bore. Caliber is generally measured in hundredths or thousandths of an inch. Two calibers using inches as a measurement are:
- .22—Means 22/100th of an inch. A cartridge example is the .22 LR.
- .30—Means 30/100th of an inch. A cartridge example is the .30-30.
A decimal point (.) always precedes the caliber when using inches.
Sometimes the metric system (millimeters) is used. Two metric calibers are:
- 6 mm—Has a bore diameter of 6 mm. Examples are 6 x 47 and 6 mm Remington.
- 7 mm—Has a bore diameter of 7 mm. Examples are 7 x 57 and 7 mm-08.
The larger the caliber number, the larger the diameter of bullet that the gun shoots. For example, a 7 x 57 rifle uses a larger diameter bullet than a 6mm Remington rifle. A .30-30 rifle fires a larger diameter bullet than a .223 Remington rifle.