Maybe it's just me, but I went through a whole case of A-Merc .223 (500 rounds) and had no problems.
I won't buy any more of their .45 though - the rounds felt underpowered, and the ejected cases seemed to have an affinity for coming straight back and hitting me in the head. For range ammo I'm sticking with Blazer in .45.
Then again, I had only one problem with the Olympic ammo people have been ragging on - a stuck case. Other than that, I've had 700 rounds of blasting fun with it, but the price isn't good enough to justify the risk of getting a lot similar to what others got who had all the problems.