Colt Walker of Texas had been the major purchaser of the early Paterson Holster Pistol (No. 5 model), a five shot cal .36 revolver, and Samuel Walker became familiar with it during his service as a Texas Ranger. In 1847, Walker was engaged in the Mexican-American War as a captain in the United States Mounted Rifles. He approached Colt, requesting a large revolver to replace the single-shot Aston Johnson holster pistols then in use. The desired .44-.45 caliber revolver would be carried in saddle mounted holsters and would be large enough to dispatch horses as well as enemy soldiers. The Colt Walker
Snubnosed revolver States. It featured a 2.5" barrel and was chambered for .442 Webley or .450 Adams cartridges. Webley produced smaller scaled .320 Revolver and .380 calibre versions later, but did not mark them with the British Bull Dog name. The term "bulldog revolver" would go on to become synonymous with large caliber "snubnosed revolvers." The Colt M1877 Double Action Revolver is a 6-shot, double-action revolver manufactured by Colt from January 1877 to 1909 for a total of 166,849 revolvers. The Model 1877 was offered in three calibers, which lent them three unofficial names: the .38 Long Colt "Lightning", the .41 Colt