Well, it wasn't by the "book". In order to get the bullet big enough to fit the throat, the alloy was linotype, size .462". There were no fillers or wads, I just left the TD on the bags, tapped the case on the rim to settle the powder, and gently slide it into the chamber. The rifle shot 160+ rounds over the weekend and I never patched the bore, NRA formula 50/50. No leading or fouling issues when I got it home, a couple of patches of Ed's Red cleaned it up fine. The bore has "salt and pepper" for a couple of inches in front of the chamber, but I did the old gun trader trick of rubbing in Lee Liquid Alox into the barrel and polishing it up before the match.
The 24 grains of 2400 has shot well in every 45/70 I have had. It is a max load in the TD, about 20,000 CUP, but light in everything else.