Come on guys, it's .45 Colt, not .45 Long Colt or .45LC. There is no Long Colt or Short Colt in .45 caliber. That being said Ruger .45 Colt revolvers are strong enough to use +P ammo, which can be loaded hot enough to equal a .44 Magnum, but with even heavier bullets. So, you can use anything from the most anemic cowboy loads to serious hog hunting loads, plus the other cylinder will handle any .45 ACP ammo including +P. You could also shoot .45 Super in it if you want to.