45 LC

.45 "Long Colt" cartridge. 45 LC is not considered a proper designator, but is nevertheless widely used colloquially. Usually fired out of Old West-model Single Action revolvers by Cowboy Action Shooting enthusiasts, but will also fit modern double-action revolvers that are chambered to fire the .454 Casull round. Replaced by the .45 ACP (Automatic Colt Pistol) round.