I believe the stepped chamber without a forcing cone was designed and cut to receive the “B” or brass shell and the chamber cut with a forcing cone was designed for use with paper shells.
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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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