I don't think there is any logical answer to these questions. The reasons for chamber length vs. shell length probably died along with the men who devised them.
Determining 'originality' may be the only good reason for measuring chambers these days, in view of the fact that none of us intentionally overload our old guns, either by length of cartridge or by the ballistics of the loads we use.
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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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