Well hell of a deal Sir Ron, didn't know you were a 50 1-3/4" fan, i'm fast becoming one too, what a fun little round slap full of history.
My rifle is a 30 twist, 30 inch standard weight barrel. Bullet is .512" and 1.130" long, weighs 530 grains, is a round nose flat point with about a 180 thou meplat, 30 twist will easily stabilize that.
I knew i'd be compressing powder .650 thou with a 10 thou playing card wad on top in the stubby little case to cover half the front driving band at the case mouth, so went straight to the power powder, Old Eynsford 3F, 70 grains of that gives 1250 fps, that's a pretty damn sold punch from the old round, i'll shoot it for groups tomorrow if i can get caught up a bit, i loaded near 100 rounds of that today, it was a blast.
