Boo, hiss.
As for the powder difference, it's hard to say since I don't use RL-7 in the .308. I have used RL-15, but it's a different burn rate, so there is no good way to compare apples to apples.
Based on the velocities I saw when I tried H4895 in the 7.62x39, I would have to load that with close to 30 grains to equal what 37 grains in the .308 produces. I'm sure the size of the case/chamber creates more pressure with the smaller round, which is why we get better velocities with less powder. But I don't know that for sure. I'm still a little cloudy on how case size and room inside the case, seating depth etc. affect pressure.
What I have learned now is that I have a surplus .308 since my 7.62x39 can do anything my .308 did with reduced loads, and my 7x57 with strong hand loads gives me a 300-yard elk gun which is more than I may ever need anyway.
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