It can be done that way, but it is much better to use a swedger. Dillon makes a primer pocket swedger that is great, but not cheap. RCBS also makes a die set to do it in your reloading press. I haven`t check on the price of them in years, but would recomand you go that way. AND, like Stimly said, the cases hvae alittle less volume. I`ve loaded 1,000`s of rounds in mil brass and there is nothing wrong with it, after you get the crimp out.