An 0-frame 28 gauge Parker would normally have been chambered for 2 1/2" shells... meaning the chambers would normally have been cut at 2 3/8" or 2 5/16".
A relatively small number of 28 gauge Parkers were built on the 0-frame size (the standard frame size for the 20 gauge gun and for the "light" 16 gauge gun.) The 00-frame was introduced soon after the 28 gauge guns were being offered and these are likely the frame size that were more often chambered for the longer 28 gauge cartridges that "Researcher" refers to - although the 28 gauge built on the 0-frame size had pretty stout wall thickness in the area of the chambers.
2 3/4" original chambers on one of these is extremely rare. It's like a 3" 20 gauge.
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"I'm a Setter man.
Not because I think they're better than the other breeds,
but because I'm a romantic - stuck on tradition - and to me, a Setter just "belongs" in the grouse picture."
George King, "That's Ruff", 2010 - a timeless classic.
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