After a friend of mine fired 3k of XM193PD through his carbine with no function problems of any kind noted, I felt confident enough to buy some despite the mixed reports here. I bought 2k from Natchez when they had a good deal on it.
So far I have been fairly disappointed... a couple of the rounds are clearly unsafe to fire; but at least those are something you can spot visually when loading the magazine. The other problem is I am seeing between 2-3% of the rounds fail to ignite the powder properly. It sounds like a squib round and the bolt doesn't cycle at all. So far all of them have left the barrel; but at substantially reduced velocities. Today I heard one bounce off the wood backstop at the 100yd line.
Every time this happens, I break it open to verify the bore is clear and every time I do I see a trail of unburnt powder all the way down the barrel in a line at the bottom. In addition, unless I boresnake the barrel, the next round goes out really hot (making me think the next round is igniting some of the unburnt powder from the previous round).
So far I have fired about 700rds of the 2k. Out of that batch, I've had probably 10 squibs. Just a heads up that this is NOT first rate ammo and it sure as hell isn't worth the price I see it going for...