Buffalo Bore developed a couple standard pressure 45 Colt loads that would feature a 255gr. Gas checked soft cast bullet at around 1,000 fps or a 200gr. Jacketed Hollow Point at around 1,100fps. they wanted loads that were substantially more powerful than today's 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 post-war 45 Colt that is in normal working condition.