I was able to form cases from 45-70 by first starting the necking using 45 LC then using 44mag dies to make the ck then I usen a 6.5 MS to get to the right dimensions, then trim. I next fire formed the brass.
The cases fit and function well. What load should I muse? I purchased molds from Accurate in .422 since the bore is .419. The bullet weight will be 260 grains. I will use black powder but would like to use 5744 for smokeless if possible.
I assume this would be a good deer round.
Nick