Nick-The OP asked about developing +P loads for 9mm and .45. I dont know if Power Pistol is suitable for those types of high performance cartridges. I probably should have worded my response more clearly. Thank you for pointing that out.I'm not sure what that means, as "+P" is a function of pressure. Please be assured that Power Pistol is quite capable of developing +P pressures, and well beyond and into catastrophic firearm dismantlement
Power Pistol is capable of an overpressure, I am not sure it will give you the performance you are looking for at +P+ levels.