Just acquired an 1876 in 40-60. The original rifles hd a slow twist of 1/40 and used a bullet of around 210grs. The current reproduction lever guns employ a mush faster twist rate of 1/20-1/22 which would seem to dictate a heavier bullet of at least 235grs. Bore diameter is .406.
I will be using real BP as the propellant and probably a hard cast, moly coated bullet. I know the hard cast and moly coat doesn't sound right for BP but I use a fiber wad, grease cookie and and over shot card wad. Works real well in all my other SASS firearms. Reducing the case capacity a little will dictate using FFFG instead of FFG.
Any thoughts or suggestions would be greatly appreciated.
Thank you.
Chas B