.45 ACP - Wikipedia
https://en.wikipedia.org/wiki/.45_ACP
webThe .45 ACP (Automatic Colt Pistol), also known as .45 Auto, .45 Automatic, or 11.43×23mm is a rimless straight-walled handgun cartridge designed by John Moses Browning in 1904, for use in his prototype Colt semi-automatic pistol. After successful military trials, it was adopted as the standard chambering for Colt's M1911 pistol.
DA: 7 PA: 48 MOZ Rank: 44