I am not even sure if they have a can on them. I am thinking they don't. Looked them up and found a you tube vid. Shows that there should only be to a slight ghosting of where the crimp was. I will crimp a couple of dummies and see what I can do. I prefer a roll on .357, but they say not to load over 1150 fps so a taper would probably work. I am not going to load them to hot. Honestly I will load the XTP's to full 357 and these more than likely to 38 plus p for the range.