Milton, just for info ..... unfired 10 gauge - 3-1/2" shells (either vintage papers or older & modern plastic) will not fully chamber in factory-original Ithaca NID Super 10's that were made for American 2-7/8" shells. I have tried it on multiple Ithacas. Shells will stick out of the chambers by about 1/4", cannot be forced in with finger pressure, and will obviously prevent the barrels from closing. I don't know about Bonehills or other makers but I wouldn't be surprised if your chambers had been lengthened for 3-1/2 inchers.
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