Put a couple hundred rounds of Fed AutoMatch through the 15-22 with no issues. I bought a few boxes of it at WallyWord a year or so ago but haven't seen any around since. As I remember, it was about the same price as the Fed Value 550, but the box is only 325. I was shooting steel today (ding ding) so I'm not sure how accurate it was. 200 wasn't enough to convince me that it works its way through the magazine better than Fed Value Pack, but I'm gonna stuff two boxes through it next weekend and see what happens.