I have a GH two barrel set , 73201 with both the waterfowl, and upland barrel sets chambered 2 7/8 inch. The chambering is supported by the archive, as is the 1 lb difference in weight. Both barrel sets balance precisely at the hinge.
The Parker catalog specifies that chamber depth is cut at the customers option, at no additional charge. It should be noted that, in this era , most long chambers facilitated a longer wad, not an increased load.
Best, Austin
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