I used to be an XM193-only ammo snob, but then the price kept going up and then it virtually disapeared altogether. Because of this I broke down and bought 500 rounds of the 55 grain Wolf. It's worked fine so far in all 6 of my ARs (Bushmaster x2, Colt x2, RRA, and Cavarms) at my monthly rifle matches. I'm going to try ordering up some of the 62 grain and see how it does.