The L.C. Smith Collectors Association
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Re: 10 gauge shooting both barrels at once
One way to verify what Mr. Rotelli is suggesting, and I'd bet that he's correct, would be to try firing the other barrel first. If you can fire the other barrel first without having the gun double, then it's likely that the sear/hammer-spur interface is worn and needs to be trued up.
Where are you located?