I have two AR/308's. One has a 16" bbl with adjustable gas.
With it I can shoot all bullets pretty much exactly how fast as I want to shoot them. Using the Hodgdon formula using H4895 ONLY I can duplicate 30-30 vels. Check out the Hodgdon site for reduced (60%) loads.
I have 4lbs of H4895 for this purpose only.
(Follow directions exactly) --- SAWMAN