Well today was the first test of the PRS- .454-250-RF, some of the bullets I got from ButlerFord45. I shot about 40 rounds(all I had loaded) through a 1860 Henry with 24" barrel. They were unsized and panlubed with bee's wax, mutton tallow and parfin wax. Nice little lube star on end of barrel and after that the barrel was sooty, but clean. Load was a case full of Swiss 3F powder, 250 grain PRS- .454-250-RF bullet, thin fiber wad, magnum CCI primer. The cases came out with almost no blowby, just a little discoloration about half the length of the case, very little got into the action.
I just got the Henry Friday and still need to do some sight ajustments, namely filing down the front sight blade, it shoots about 5" low at 30 yards.
I am very happy with this bullet and load, though on future loads I think I'll switch to Graf's black powder, it's a bit cheaper than Swiss and still a very good black powder. The bullets mike out to just a hair over .454, I think I'll size them down to 452, and see how they shot, if that doesn't work, I'll size to .454.
Thanks for the help everyone,
Will