How worn is the rifling? Are there any inconsistencies in it, like a ring partially down the barrel or nick damage at the muzzle? A squib improperly removed could leave significant damage.
Check to see how far a 9mm fmj bullet will fit down the muzzle. There should be a fair amount of space between where it stops and the cartridge case mouth ends.
If the barrel is shot out, it can be replaced.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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