I have several of the older 25-2 and 625's and sometimes like using the ACP rounds without the moonclips. if I used a roll crimp on an ACP shell, I know I will have some misfires as the older guns headspaces on the case mouth and use of a roll crimp will cause the rimless acp brass to feed too deeply into the chamber. The auto rim will take anything just as long as you crimp to specs.