The convertible plugs are made to shoot BP in a modern shotgun.....and can be done......but not the other way around.
You still need a primer and powder.....
BP is a whole harder to find, as it will be in bulk, not a already loaded cartridge.
So although it sounds logical.....
I have ammo, but no gun that fits,....and a BP rifle/shotgun, with a convertible insert or made that way.
This is sounding like an in-line.
I dump the smokeless powder into a modern ML (should be OK right?)....some are actually made for using smokeless powder.....and touch it off with a #209 (shotgun primer)
Everything would have to be exactly right, modern steel muzzleloader made for it,... powder that works (any idea how many options that makes?)...and of course primers.....
Images
https://www.google.com/search?q=shoo...w=1093&bih=498
Best to just put this out of your mind as a bad deal.....
