I saw all those threads while I was deciding to buy a 45/70.
Looks like 4759 was awesome, and then someone decided to stop making it.
After a lot of reading, I settled for 4198 and the one that will most likely be the best choice.
A lot lf the powders suggested in the Lyman book and marked black as the best choice, have poor reviews, very dirty and so on. And maybe they work well on rifles but not on revolvers.
If you go to my first post, before the BFR blew up, I was getting a nice group with 4198.
The plan:
1. I will bring some of my molds to the casting seminar. And learn how to coat the bullets with those.
2. I will cast 405, 500, 535 grain bullets at home.
3. I will try them all with 4198 and see how that goes. If 4198 is not good , I will move to the next powder and do it again.