As for powders in 45-70
My preference for lighter bullets (350 grain and lighter) is 4198 and for the heavier bullet is 3031
Both my Marlin guide gun and Ruger #1 shoot touching groups at 100 yards with factory Hornady 250 GMX or 325 FTX- I don't find the FTX to produce consistent terminal and don't hunt with them (they would be ok for deer).
Be safe
Ruggy
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