I have shot a few they never jamed. The acecy is so so 2in groups some times more with some surplus ammo 4+in groups poped up. the 7.62x39 Is the sks\ak round its on par witha 30-30 in power Its counted as a 30 cal. .308 dimater bullets but in original loading "non american up.312 in dimater. the 308 win. Round or 7.62 NATO and I think"7.62x51mm" is alot stronger round.