Hi there not sure I can offer much, having been out of muzzle loading firearms for ages but I met Tony in his workshop in Auckland in the late 70's and purchased one of his 58 cal round ball guns. I think it had a 1/72" twist barrel. It shot bloody well I remember and I bowled over 4 deer with it and that big 280 grain ( I think ) roundball just wasted them. His barrels were said at that time to be very good. Mine was a caplock.
I believe there's still plenty of keen black powder guys still out there who I'm sure can help u more than my old memories. Cheers Rob.
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