Though many think the 44 Mangum is a 0.44-caliber, the bullet diameter is actually 0.429-inch, and with the best loads, like Federal’s 270-grain HammerDown, the bullet will mushroom with a ...

The 1860 Army 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 .45 Peacemaker ...