My 9mm Shield does not like Federal for some reason. My wife's will eat Federal all day long. Hers has never once has had a failure to feed. Mine will have at least five or six ftf's per box of 50 with Federal, but, seems to work fine with everything else. That said, I am reluctant to carry that particular weapon even not using Federal. I have shot tens of thousands of various manufacturers rounds through my three Glocks and have only had one failure to feed and, that was the very first shot I ever took with my first Glock, a 19 gen 4 and that was because I totally limp rested it. I would feel comfortable carrying my wife's Shield though, but, I think I'll stick to my Glocks and I'm really getting the bug for a Shield .45. I think that would be a nice gun as long as I can trust it.