THERE IS A DOWN SIDE TO THIS AND i SHOULD HAVE MENTIONED IT. BE DAMM SURE YOU DONT GET A 311-308 ROUND ACCIDENTLY MIXED UP AND FIRED IN A .308 BORE. YOU LIKELY WILL SEE SOME EXCESSIVE PRESSURES TRYING TO SHOVE A .311 BULLET INTO 308 BORE
On the other hand the Romanian RPK I have has a chamber diameter of .905 and the Green Mountain M76 barrel has a OD of .907. That is good bite and add a barrel pin it should be great. RPK furniture on that with a PSL receiver might be nifty.
But back to the Yugo M72, I believe I will go the route of the .308 with the .311 projectiles.