I find it odd, the people who seem to think you can't shoot 308s in a 7.62 or vica versa (same with the 223 v 5.56) don't have much experience except what they read on the internet. I've been shooting both in both guns for 30 Plus years, Not just my guns military guns running the AK NG Marksmanship unit. I have had seen zero problems but I also have been told I was full of poop.
Whats funny, the same people that rant about the headspace differance scorn me when I warn of using case gages to get cases propertly sized for gas guns.
But hay, what do I know.
CPT USAR Ret
USAMU Sniper School Oct '78
Distinguished Rifle Badge 1071