I've not tried .308 bullets in any of my supposed .310 guns (AK/SKS), but from my research, it seems that even guns that are supposed to be .310, there are groove to groove diameter differences sometimes. Not sure which ones, but I think some new guns are made with .308 barrels to "cure" the bullet issues? From what I've seen, Greg is right in that reports are all over the map on accuracy, but for plinking, I dont think there's any harm in shoving a .308 bullet down a .310 bore?? I find it interesting that 7.62x39 import ammo is sooo cheap loaded (~$5/bx/20), and bullets alone for that cal. are ~$0.20/pc or $4/20 pc!?!?!?! And .308 bullets are cheaper at times, esp in pulls and blems??? You generally cant load 7.62x30 for anywhere near the price of the Russian stuff, but if working towards consistent accuracy, of course loading your own is the way to go.