The year 1873 saw the introduction of two game-changing firearms—the Winchester Model 1873 lever-action rifle and the Colt M1873 Single Action Army (aka “Peacemaker”) revolver. What set them apart from the array of available arms was that they were among the first chambered for center-fire metallic cartridges to be used in tandem.
Each firearm initially used its own proprietary round. The Model 1873 was chambered for the .44-40 Winchester cartridge, which went on to become one of the most popular rounds in firearms history. Purpose-built for the U.S. Cavalry, the Peacemaker was initially designed with a 7½-inch barrel, for accuracy at longer ranges, and chambered for use with the hard-hitting .45 Colt round. Not to rest on its own laurels, Colt then offered civilian versions of its revolver
