hmmm... that's kinda odd seeing as the 7.62 and the .308 are pretty close to the same round with the exception of chamber pressure with the .308 . The failures i've heard occurring is blowing the barrel, due to powder overloads to increase muzzle velocity... but this only happens if you are running self loaded overcharged rounds, i don't think i've heard of failures with manufactured rounds with specific loads... with the exception of them not using a heavy barrel. Sometimes people like to crop as much weight on their weapon as possible while still maintaining functionality.... the barrel is not the place you want to reduce your weight on a high velocity weapon...