There is no difference. ACP stands for Automatic Colt Pistol.
The .45 ACP--which stands for AUTOMATIC COLT PISTOL is used in semiautomatic pistols. The .45 Colt is used in revolvers.
.45 ACP means Automatic Colt Pistol. It IS .45 Auto.
ACP designates a cartridge desgined by Colt for their pistols- Automatic Colt Pistol. LCP is the name used by Ruger for a model of lightweight compact pistol. LCP
.380 ACP is a specific type of ammunition made. 380 LCP is the name of a Pistol, made by Ruger which fires the .380 ACP round.
Measurements as in ammunition size? 45 ACP (Automatic Colt Pistol)
ACP stands for Automatic Colt Pistol. They are the same.
There is no 45 apc, but, there is a 45 acp. The 45 Colt is a longer cartridge. There is no 45 apc, but, there is a 45 acp. The 45 Colt is a longer cartridge.
Different designations simply mean different things. ACP stands for Automatic Colt Pistol, meaning it was originally designed for Colt Auto Pistols, however, pistols from various manufacturers will fire ACP ammo. Other designations, such as SW in .40 SW means the cartridge was designed by Smith and Wesson. WCF stands for Winchester Center Fire. GAP stand for Glock Auto Pistol. There are various others.
'ACP' means Automatic Colt Pistol. A 1911, for example, would chamber a .45 ACP cartridge.
The .45 GAP is a shorter cartridge than the .45 ACP. Developed for the Glock Automatic Pistol (that's the GAP) it does not interchange with the .45 Colt Automatic Pistol (ACP). Made for a smaller firearm, shorter action, etc.
ACP stand for Automatic Colt Pistol