Send the gun to a barrel smith. Let him look it over and make recommendations. Kirk Merrington comes to mind. If there is enough wall thickness ahead of the chokes the barrel can be jugged choked. I don't have personal experience with it but I have read that lengthening the forcing cone will tighten up the pattern. Most recently Chuck H. posted here about lengthening the forcing cones in a 410.
Best,
Mike
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