45-cal. Single Action Army—which was initially ... replacing it with Colt’s New Army & Navy double-action revolver chambered in .38 Long Colt—a smokeless-powder cartridge with roughly ...

The Colt Single Action Army revolver, introduced in 1873, became a symbol of power and American expansion, used by both outlaws and lawmen on the frontier.

Of Colt's Model 1877 double-action revolvers, the Lightning is the most well-known, chambered for the .38 Colt cartridge.