That was an interesting experiment. I don't know of published loads for using Black Powder with the .45acp. Did you find some from a manufacturer?
Black Powder must burn at rates quite different from smokeless powder. I know that, unlike smokeless powder which is an accelerant, it can also detonate.
What chamber pressures did you measure? What did the pressure curves look like?
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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