Sounds like XM855PD... This ammo isn't perfect, you may find quite a few dented rounds [don't shoot the badly dented ones], you may even find a few more serious issues. Just check each round as you load it in the mag and you'll be good to go paper hunting, here's my process:
#1 Hold the round at arms-length, make sure everything is 'square', eg: make sure the bullet isn't 'bent' [improperly seated] in any direction. Also look for any serious dents in the case.
#2 Look at the case-neck up close, where the bullet meets the brass, make sure the bullet isn't seated too deep, or not deep enough. If you can't see the bullets cannelure, it's seated too deep, don't shoot it if that's the case. If you can see any of the 'smooth' part of the bullet behind the cannelure, then the bullet is under-seated, and don't shoot it in that case, either. [note: If you can barely see the cannelure, that is acceptable.]
#3 Turn the bullet over, and check the case head, check the rim and make sure it isn't bent, check the primer and make sure there's nothing screwy about it, make sure the case head itself isn't deformed in any way.
Once you've done those three steps, if the round passes all of them, load it in the magazine. Toss any rounds that don't pass in a 'reject' pile, then post pictures of those rounds here so you can annoy all the anal-retentives.
Personally, I wouldn't use XM855
PD for anything but putting holes in paper... It does that fine, but I wouldn't trust my life on it. It's plinking ammo and always will be,
ANY 'M855' type ammo that comes lose-packed is going to be XM855PD. Normal XM855 will come packed like regular ammo, real M855 will usually come on stripper clips in sealed containers of one type or another. ANY M855 TYPE AMMO THAT IS LOSE PACKED IS XM855
PD.
I don't mean to yell, but lots of people get ripped off that way.