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Try cleaning the heck out of it with a good lead solvent. Sometimes leading can make it seem as though the rifling is gone, when it's only filled up.
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+1, particularly if the rifling uses unusually shallow and/or round-edged grooves. Gunmakers have used a variety of rifling types over the years, and some look quite unusual. Also, keep in mind that .380ACP and .32ACP are low-velocity cartridges, so a shooter would conceivably have to fire a very large number of rounds before any noticeable barrel erosion would occur.
Can you post a picture?
Does the inside of the barrel display any unusual signs of damage?