This abbreviation stands for "Automatic Colt Pistol". Cartridges with the "ACP" designation are straight-wall cartridges that are all used in self-loading pistols. By definition, an ACP round is not used in revolvers or rifles, but are exclusively used in pistols.
.32 ACP
Released: 1899
Bullet Diameter: .3125 inches
Case Length: .680 inches
Bullet Weights: 60 to 75 grains
Designed by Browning, it was originally manufactured by Fabrique Nationale, a Belgian Company. This cartridge is often considered a European round. It becomes a popular rounds in the 20th century and often used by German police and popularly associated with James Bond movie.
.38 ACP (not to be mistaken with the .380 ACP)
Released: 1900
Bullet Diameter: .356 inches
Case Length: 0.9 inches
Bullet Weights: Roughly 115 to 130
.38 ACP is hard to find these days. You can find .38 Super rounds, but .38ACP have largely been left untouched by manufacturers due to little demand.
.38 Super phased out .38ACP, which is considered to have higher pressured version.
380 ACP
Released: 1908
Bullet Diameter: .355 inches
Case Length: .680 inches
Bullet Weights: Usually 80 to 120 grains
Not to be confused with the .38ACP or simply "thirty-eight", the .380ACP (Three-eighty) has been choosen as one of the popular self-defence round ever since its release.
.45 ACP
Released: 1905
Bullet Diameter: .452 inches
Case Length: .898 inches
Bullet Weights: 100 to 230 grains
The .45ACP is one of the few "ACP" cartridges created specifically for military purposes. To these days, the .45ACP remains one of the most chosen pistol cartridges around the world especially in America. Used by tactical forces, military personnel, and sports shooters.
It was commonly used by US Army in Vietnam war and WW-2 for sidearm.
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