The standard chamber length of that era was 2 1/2" and a 2 7/8" chamber was strictly to accomodate shells loaded with thicker over-powder fiber wads. The reasoning for the thicker wads was to better bridge the step from the shell mouth to the distal end of the forcing cone thereby preventing gas leakage forward into the shot column or back past the shell.
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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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