Another good powder, that is similar to Accurate's 5744, is IMR SR4759. It is an excellent powder for reduced loads, I use it in my .338 for a fur load, and works well for me in the .450 3 1/4" BPE. Haven't tried it in the 45/70 yet, but plan to seein as how I had to order the powder, local shop's supplier doesn't carry it, and bought enough to make paying the HAZMAT fee worth it.