When you get the brass take a look and see if it just cut down 50/70 govt brass. My 56/56 brass that I got from them was, so i decided to just order the 50/70 brass and cut it down myself to save the money. Compare the prices on the brass and you will see. I have also been using 50/90 brass [it was in stock at the time when the others weren't] without any problems firing it. I'm still working on getting the AOL of the loaded cartridge tweeked.