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Yup that makes sense, as stated it all depends on barrel diameter and I'd add steel alloy type.When I sent my GPR, I asked for 60 or 62 cal for obvious reasons. Bobby told me my barrel was 15/16 and because of dove tail cuts and screws holding the ramrod rib, that he could only go to 58 cal safely!!
I don't have much faith in 12L14 ( which a majority of muzzle loading barrels are made of )after witnessing one come apart from a short start patched ball and moderate charge.
Reaming a bore free of rifling is not rocket science, and the core of discovery freshed out the rifling on one using a broke file fragment for a cutting head on a stick while in winter camp, it's actually the deep hole boring and keeping on center with minimal run out is the tough part of barrel making !
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