45 ACP (Automatic Colt Pistol) cartridge, it became the U.S. Armed Forces’ standard-issue sidearm following the failures of the Army’s .38 Long Colt revolvers during the fight against the Moro ...

Jesse James lived by the revolver ... Colt shot .44 caliber bullets, which did much more damage. And by the time of Jesse's bank robberies in the early 1870s, the weapon of choice was the Colt ...