Johnny Reb,
WOW! That is a beautiful flintlock. Is that a curly maple stock?
I have a .50 smoothbore T/C flinter that likes 75 grains of 2F Goex and patched round ball or the charger set at 75 grains of #6 shot here in the PA hills. I have surprisingly good roundball accuracy out of my smoothbore out to 75 yards; all hits at that distance are in the 5-inch bullseye.
Since your smoothbore is .62 caliber and the 20 gauge shotgun is a nominal .615" bore, you may be able to use modern plastic 20 gauge wads for your shot loads. That will simplify things and shot collar wads may give you some degree of choke. As for roundball, find a .60 or .61 ball and tweek with .010 or .015 patches. I would see if a rear sight could be dovetailed to give you a consistent aiming point. My .50 smoothbore barrel has the typical T/C front and rear sights which helps with roundball shooting.
Good shooting!
Adam
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Adam Helmer
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