I think you'll find out that in the 308 velocity doesn't mean accuracy. Best luck I've had with the 308 is with 4895 then again I don't load for velocity.
Can't tell you about the 7.62X39 as I have had much experience with it.
I wouldn't think the two would use the same powder effectively.
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Kraig Stuart
CPT USAR Ret
USAMU Sniper School
Distinguished Rifle Badge 1071
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