Some rifles had coned muzzles to make starting the patched ball easier. These often look like smoothbores from the muzzle. Also, wooden ramrod wear often obliterates the rifling near the muzzle. Dirt embeds in the wood and acts like a lapping compound causing wear at the muzzle. It's why serious target shooters use stainless steel loading rods with bore guides instead of wooden ramrods.
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Hanlon's Razor
"Do not invoke conspiracy as explanation when ignorance and incompetence will suffice, as conspiracy implies intelligence and organization."
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