Through 600 rounds now, I've had no failures with my LR308, period. I've shot 125 grn to 180 grn bullets, steel and brass case, milsurp, factory ammo, and even my own reloads. It ate it all. Sure, the Barnaul steel case wasn't particularly accurate, but it cycled just fine. Mine has the .308 chamber, too. I have not tried S&B ammo in mine, but if I had some I'd give it a go. I will state that when I shoot it, I keep the pace relatively slow and don't warm up the barrel too much. So, if you're looking for a bumpfiring platform, don't give my review here any credence.
Compared to FALs, the chamber on the LR308 is tight. Drop a round into the chamber of an FAL and wiggle the head with your finger. In the FAL, the round wobbles around like a drunk staggering to the restroom (not really that bad, but there is some wiggle room). The movement of the same round dropped into my LR308 chamber is almost imperceptible.
I'll admit that I'm shocked at the reliability of the LR308. I bought the gun for the accuracy, and, frankly, I had no expectations about stellar reliability. However, I'm quite impressed with the gun so far.