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blackpowder and smokeless do not work the same way.
besides there were in the late times of the 1800s, 7 granulations of blackpowder, they came glazed and unglazed.
however the final gun you end up with is going to be limited by the choice of propellant. if you want something that will do better with black powder residue, your going to want to go stainless.
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