I have 50 test rounds ready to go.
I'm using pulled .308 180gr projectiles and the powder from 1940's Bulgarian 7.62x54. (Crappy brass berdan cases, beautiful bullets and powder)
Previous testing proved the powder to be similar to IMR 4320 and 4064.
10 rounds each, 42, 42.5, 43, 43.5 and 44gr powder charges.
I'm looking for just under 2600fps, and the best accuracy.