By "minute of Apache" I meant that with a case full of FFg and a 450 grain bullet it was about accurate enough to hit an enemy at cavalry ranges. He had not made the effort to find a top load for the old gun, he only shoots it on what another friend calls "ceremonial occasions."
Many of these old guns have oversize barrels. When converted from percussion to cartridge, the barrels were gauged. I think at .5225" Anything over was relined, anything under was used as is. The sudden acceleration of black powder and a soft bullet should make a .512" bullet "bump up" to fit a .52 barrel well enough for the cavalry.
All I can say is to give yours a try and let us know how it works out.
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