I have a lifter that I bought as a 12 ga. When I shoot it, the shells split about 25% of the time. I measured the chambers and barrels and It is, by measurement , an 11 ga. The Parker book lists it as a 12 ga., however by the serial number, it was built in the time frame when several 11 ga guns were made. In view of this, I don't see how a 12 ga shell shot in a 10 ga gun would not split. JMO. Carvel
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