Lloyd, I use my RCBS puller for "oopsey" 45-70 loads without any trouble. As you know, most of mine are paper patched which doesn't present a problem as there's no crimp, but on occasion, I load Remington's 405 grainer for my partner's Guide Gun. Yes, I've had to pull them. The chuck fits over the case without undo problems and that heavy bullet easily "breaks" the crimp when you slam the puller down on a cement floor.