Mike:
Diagnosing your problem via these posts is risky at best. If I were to put in my guess, I'd say the clearance between your barrel loop and forend iron cut is too tight. This is a simple fix for a good 'smith. Emphasis on GOOD. But... physical inspection by a good 'smith will reveal the actual problem. It is probably not expensive to fix. In your part of the country, I'd contact Hugh Lomas. He's in WI. And he is good.
Best, Kensal
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