Caliber n. : Alt. of Calibre

Example:
What is the best handgun Caliber for hunting small to medium game?

Taxonomy
caliber, diameter, cartridge, barrel, bullet, calibre, gun, bore, bore diameter, projectile, measurement, grooves, gun barrels, inside diameter, shotgun, Firearms, measure, millimeters.

Defination from the web:
caliber is the approximate diameter of the bullet used. ... As an example, the main guns of the Iowa-class battleships can be referred to as 16"/50 caliber. ... The bore to barrel length ratio is called caliber in naval gunnery, but is called length in army artillery. ...