Missileer

Does anyone know how Colonial gunsmiths made a musket barrel and later cut rifling grooves in them? I know that in places like the Appalachian Mountains that were pretty well isolated, accurate, rifled barrels were produced using fairly crude tools.

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“War is an ugly thing but not the ugliest of things; the decayed and degraded state of moral and patriotic feelings which thinks that nothing is worth war is much worse.”
—John Stuart Mill