This ammo does appear to have a history of issues. just two cases from the CTD forum......
When I first got these rounds they seemed to be the best bullets for the money. However after shooting them a few times I started to notice that they blew the primers out of the back of the case. The primer came out and went into my trigger assembly and locked up my gun. The other day I went out and started to target practice with my AR-15 and when I shot the 19th round the back of the bullet exploded. After inspecting the gun and bullet I found out that I had ss109 rounds in the clip. The primer had came out of the 18th round and went into the throat of the chamber, throwing the head space off. The other round in the clip also exploded ( glad it was only one round and not more ). Now I have to go out and buy a new bolt for my rifle. So if you have these rounds or are buying these rounds watch out for this problem. (Editor note: Please have your chamber checked for excessive headspace or badly fouled chamber.)
This ammo is of reasonably good quality for the money spent as far as reliability is concerned however as with anything else you get what you pay for. I have fired roughly 60 rounds out of my DPMS AP4 w/16" barrel and have had only 1 issue thus far. Further down you will see a review from "frogman" in which a bullet lost its primer and lodged in the throat of the chamber. I can vouch for this event as it happened to me as well. I have had the weapon inspected by a gunsmith who assures me it was not the weapon's fault through excessive headspace or a fouled chamber as the weapon is new (less than 400 rounds shot through the weapon) and was adequately lubricated. A member of the team I shoot with is a reloader who mentioned the only way this will happen is if the bullet is overcharged or is poorly made. Please note that in the roughly 60 rounds shot through the new weapon there has been only 1 incident where this occurred thus far. Also of note is the difference in either velocity or grain between this and standard military issue 62gr LC ammunition. It will account for about a 1.5 - 2 inch vertical difference when the rounds are shot at 25 meters.
and the link for the above
have also heard all kinds of bad things about steel cased ammo and a hot barrel.....