I use IMR SR-4759 for my reduced loads; another bulky powder.
125 gr in a 30-06 at 2700 fps. (30-40 level)
Simmons in Bessemer carries it, Bass might.
.300 Winchester Magnum - 165 grain Speer SP bullet, 29.0 grains of SR 4759 powder, CCI 250 primer, Win. case. COL 3.340". MV 2000 fps in 24" barrel. (Based on the Speer Reloading Manual No. 13.)