Caliber is the diameter of a projectile in whole numbers and round to hundredths.

Example: a .308 inch diameter bullet is referred to as 30 caliber or a .458 in inch diameter bullet is referred to as 45 caliber. In some cases for the purposes of advertising, a caliber is round to some number that sounds good; a .429 inch diameter bullet is referred to as 44 caliber not 42 or 43.

Caliber can also refer to:

• the diameter of a bullet or other projectile
• the diameter of a bore of a gun usually expressed in hundredths or thousandths of an inch and typically written as a decimal fraction
• to find the caliber of a round, take the diameter in milimeters...and divide by 25.4...the answer will be a decimal (example. .22 for twenty two caliber)

Military UsageEdit

The American Military uses SI (metric system) to classify weapon cartridges. For example: 7.62x51mm NATO and 5.56x45mm NATO.

Caliber EffectivenessEdit

In most cases the bigger the calibre the more powerful it is within a particular class of cartridges; such as pistol, rifle, black powder, military small arms, military large arms etc.…