Difficult to understand the mechanics of such a design being an effective choke as we know it.
Do I understand it to be a sort of ‘hour glass’ internal shape?
.
__________________
"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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