ORIGINAL: Roskoe
Obviously, the original load for this caliber was 30 grains (by volume) of black powder. I'm not sure if I would load black powder here, unless for some nostalgic reason, over smokeless. Create yourself a cleanup issue. There is abundant loading data for a wide variety of smokeless powders - including somereduced loads made for cast bullets.
No, it wasn't, Roskoe. They NEVER used BP in the .30/30! It was a smokeless powder load from day 1, as was the .30/40 Krag. The .30/30 used 30 grains of someearly smokeless powder, and the .30/40 used 40 grains of Pyro DG.