Buffalo Bore developed a couple standard pressure 45 Colt loads that would feature a 255gr. Gas checked soft cast bullet at around 1000 fps or a 200gr. Jacketed Hollow Point at around 1100fps. they wanted loads that were substantially more powerful than todays weenie loads but that could be fired in ANY 45 Colt firearm. Both of these 45 Colt loads are designed to be a heavy loading yet be within standard SAAMI pressure. As such both of these 45 Colt loads are safe and recommended to be used IN ANY postwar 45 Colt that is in normal working condition.