I tried H-414, I4350, and a few more powders with 139 BTSP. Then I tried 3031, thought it was too fast, but it works in 4 rifles.
I load lighter in the 2 mil. mausers 37gr. The Doug barreled Argy and the M70 FW like it too.
40 grains of 3031.... pick a bullet from 130 to 175 grains....
most accurate in my Ruger 77 Mk 2, in 7mm Mauser....