Well Dean, I got 1/3 thru stock book 82 before my eyes and brain went dead. Not all S/N's had chamber lengths but most of the 28ga. guns had 2 3/4" chambers however I did find 2 that had 2 13/16" chambers. Would they have been for 3" shells? I did find some .410 guns that had 2 15/16" chambers. Stock book 82 goes from 235,xxx to 238,xxx.
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