MountainDevil54
What will you think once the rifle is running straight blackhorn?
What would be the issue with what you have proposed? I think should just work dandy... Have you tried shooting BH in a sidehammer with a hot #11 mag cap or maybe even a Musket Cap?
I am thinking if the the bolster opening is large enough and you just drop a few grains in the bore - then tap it out and over under the nipple, then dump the rest - it might just go boom for you.
I also do not think it would be consistently successful enough to hunt with but it would be an interesting experiment.
Back to the top... I do not think shooting a pure load of BH was ever the question - it was the unknowns of duplexing a Nitro based powder.