Mr Farrell,
I too recommend Briley. They did it for me on a 32" 20 hammergun. Both barrels were way off. They did an excellent job.
They can recut the angle of the choke and also can install an eccentric choke if the job is so severe than only one wont work.
I suggest you contact Steve Powers or the shop forman MIke. Talk to either. Also I suggest you send in a pattern with measurements to help them get it right where you want it.
They did the job for me in two weeks turn around time.
John
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