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The "abrupt ring" in the chamber is of concern. If this gun was chambered for roll crimp cartridges, and without much forcing cone, you could get some elevated pressures with anything but roll-crimped cartridges.
It would pay to have a real double gun 'smith check this gun out. Possibly even make a chamber cast if there are no pits in the chamber.
It's always better to know what you're dealing with before you are faced with dealing with the results.
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