The .32 caliber is a size of ammunition, fitted to firearms with a bore diameter of 0.32 inches (8.1 mm).
The variations include:
.32 ACP (Automatic Colt Pistol), a pistol cartridge
.32-40 Ballard, an American rifle cartridge
.32 H&R Magnum, a rimmed cartridge designed for use in revolvers
.32 Long Colt, an American centerfire fire revolver cartridge
.32 NAA, a cartridge/firearm system from North American Arms and Corbon Ammunition using a .380 ACP case
.32 Remington, an American rifle cartridge
.32 rimfire cartridge, chambered in revolvers and rifles in the late 19th and early 20th centuries
.32 S&W, cartridge was introduced in 1878 for the Smith & Wesson model 11⁄2 revolver
.32 S&W Long, a straight-walled, centerfire, rimmed handgun cartridge, based on the earlier .32 S&W cartridge
.32-20 Winchester, the first small-game lever-action cartridge that Winchester produced
.32 Winchester Self-Loading, an American rifle cartridge
.32 Winchester Special, a rimmed cartridge created in October 1901 for use in the Winchester Model 94 lever-action rifle
.327 Federal Magnum, a rimmed cartridge based on the .32 H&R Magnum with elongated case and higher pressure
