Quoted: IIRC the 7.62x39 round is inherently a very accurate round. More so than the 5.56 if i'm not mistaken.
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And where do you get this from?
Now, you can have a decent argument on said subject WRT 7.62x51, or 7.62x54R, but the x39 has nothing about it to indicate this would be the case...
It would be nice to see an experiment on the subject, maybe out of a 20" AR (yes, this is the AK side, but we can all settle that a 20" AR is a more inherantly accurate platform than the 16" AK), or a bolt gun (IIRC, ruger makes a bolt-action in x39)...
Absent firing a large quantity from the same gun using the same shooter, all we can speculate on is general characteristics...
In that area, it's known that:
1) 5.56mm is accurate out past 600m. 7.62x39 is generally limited to 300m
2) 7.62x39 has a far more severe trajectory than 5.56
3) In most cases, 7.62x39 performs like a conventional cartridge: it makes a .30cal hole straight rhru, with some shock damage to surrounding material... The concept of a high-velocity fragmenting round was discovered 'by accident' with early 5.56, and later reproduced (in some sense) with the 5.45...
Also, it should be noted that the 'prolific' nature of the 7.62x39 is primarily confined to ex-Soviet client states and 3rd-world nations, where the cost per round is the primary factor in ammunition selection...
P.S. Since the AK, AR, and a great multiplicity of weapons come in both 5.56 and 7.62x39, I would not consider this to be an issue, other than .30 AKs are far more common than 5.56 ones...