Bruce,
Thanks, those are good points. However, The chamber dimensions on page 519 of The Parker Story are good for later model Parkers in 8, 10, 12, etc. gauges only. This table does not cover all the chamber sizes found in the early under lifter guns. These were typically chambered for 10A or 10B, 11 paper or 11B brass, or 12 paper, 12A or 12B or extremely rarely for the 14A brass shells. Many of the early Parker 11-gauge guns were chambered for Parker or UMC brass 12A shells, which have the same dimensions as the modern 12 ga shell as shown on TPS pgs. 544-550. Some 11's were even chambered for 10A shells. Some of the underlifter 12-gauge guns were chambered for 12B brass shells, which can lead to confusion and the conclusion that these guns are 13 or 14 gauge (Just as was reported by Larry Baer for the Parker Prototype no. 06 in the Meriden Historical Society,which has perfect 12-bore barrels and was chambered for 2"long brass shells of diameter that can accept a modern 14 gauge shell.
Richard
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