Several companies including Federal are now making small primer .45's. Part of it is for indoor ranges with no exposed lead bullets and cleaner powders. It's supposed to reduce the indoor air pollution from lead and toxics. I have some Federal and Blazer brass that I reload and they both work just fine for the .45 ACP but you have to sort them, especially if you use a progressive loader. Nothing wrong with them and you will probably be seeing more small primer brass soon.