Wow! That seems like a lot too take off the front sight... I hope you didn’t go too much.
I did on my GPR, cost me a new sight..
Since then when sighting in a new to me gun, I start up close 12-15 yards get the windage correct then move back to 25 yards, then I make the final adjustments at...
If I were on the frontier, I would try working powder into the touch hole and shooting the dry ball out.
Other than that, I don’t see where pulling a patched roundball from a smoothbore would be any more difficult than pulling a patched ball from a rifled gun ... maybe the smoothbore would be...
Dave I grew up in NW Al, there were 2 black cherry trees on our property.
Both were at least 30”at the base, however in both cases it was 2 trees that grown together when they were saplings apparently.
I had an Uncle who made bedroom furniture from Cherry wood .
Needles, nails, old darts, scribes, exactor knives, sharpen awls ... I’ve tried them all...
Nothing has worked well for me. I always seem too have issues with the tip following the horns grain. Off track!