The .450 Adams was a British black powder centrefire revolver cartridge, initially used in converted Beaumont-Adams Revolvers, in the late 1860s. Officially designated .450 Boxer Mk I, and also known variously as the .450 Revolver, .450 Colt, .450 Short, .450 Corto and .450 Mark III, and in America as the .45 Webley, it was the British Army's first centrefire revolver round.