bronko22000

Initial shooting shows promise. With the short barreled 94 Big Bore and open sight just throwing a load together I shot a 5 shot group about 2" or a bit less @ 50 yards. Problem is that they group about 6" below the factory loads and I don't have enough sight adjustment. I got a lower front bead sight to install and will do that once my supply of factory jacketed ammo is exhausted. Or I just might sell the factory stuff and shoot these. I'm happy with them.

hardcastonly

a different powder charge and a change of powder/propellent and that change in pressure curve,
is very likely to change the bullet impact point in relation to the rifle sights,
and frequently group tightness.
don't be afraid to experiment,
powders like
imr 4064.
imr 3031,
RL7, RL12
IMR 4198,
WW748,
imr 4895
can be used

bronko22000

Yep. I've been at this reloading game for over 55 years. Even different powders with the same MV can give different results just because of their burn rates. Next batch is going to be IMR3031.
In fact, this afternoon I may just cast some more .375s and some .458s for my 45-70s

Pioneer2

RE#7 or IMR 3031 is all you'll need. I run IMR 3031/32gr under a 268gr GC in a re-bore Marlin 336 /now 38-55 and am getting 1 1/4" at 100 yards with a 4 X Leupold mounted.