Mine was having some issues with the AE stuff. Now I'm running the 525 round boxes of Blazer that you can pick up at crappy tire and my SR-22 is eating the stuff like a fat kid eats smarties! I think I've put through at least 3 boxes and very few issues as well.
It could also be that my Pmag is now fully broken in, but still, it's working great now so I don't foresee switching to anything else.