I hope you don't mind me bringing back this thread from the deep freeze.
Have you tried finding a comparable smokeless load to safely work with the 45 BPM shell. Or, can that be achieved through the regular 45 colt shell?
I enjoy shooting both BP and smokeless through my Walker, but the range I shoot at is indoor and does not allow BP. Factory Winchester Cowboy ammo or Trail Boss hand loads in the 45 Colt shells feel a bit anemic in the Walker and I would like to get your thoughts & direction on working up a load to approximate a 50 or 60 grain BP load in smokeless powder.