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Too bad. I have a NEVER FIRED Blackstar Accumax II, that could have been rethreaded, and rechambered. The barrel is gain twisted, with a "choked" muzzle, and an especially robust steel [I don't remember what steel,sorry], but my 'Smith Jim Hillen out of Texas just had to cut slower with plenty of fluid. BLACKSTAR rose in popularity so quickly that they went bankrupt. These are supposed to REALLY SHOOT!!! The barrel ALONE was $600.Found a good price on a Hart hv 14 twist.