There are some good articles out there on comparative strengths of firearms in .45 colt caliber. If I recall, some say stay less than 32,500 cup, some say stay less than 25,000 cup. Either one are fairly hot in the .45, and will probably do anything you need to. I have a 25-13 and have shot both my 300 grain reloads and the 300 grain BB through it with no problems. I talked with the BB guys before using it and they indicated they are safe in the gun but will loosen it quickly. For plinking I use factory stuff, for carrying in the woods I use the heavys. For reference, .45 acp loads run up to about 21,000 cup, alot hotter than the factory Colt 14,000 cup, and in the same cylinder and frame.