Definately a restriction of some kind. I have a 10 gauge lifter with a .006 bulge at the forcing cone. It still has .092 wall thickness and I have shot plenty of nitro loads thru it. This seems to be fairly common in side by sides of all makes as I have seen this more than a dozen times. Probably part of a wad or spider web was left in the bore. My gun does not have hammer marks and you have to look closely to see it. Hope this helps.
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