The reason I prefer the 7.62 x 39 over the 300 is I have had no issues with the rifle in 7.62x39 it is an old Norinco with a new stainless Ruger 7.62x39 barrel I got for free, not the calibers fault I know. The 300 when I got it to shoot was not a tack driver but too bad 1" at 100 I get the same out of the Norinco with the 308 barrel.