No it's not unusual but it doesn't give the exact constriction without knowing what the bore ID is beyond the choke taper. Nominal bore diameter of a 12 gauge is .729" but not all 12's share that nominal bore diameter.
Where are you? Let's see if we can find a good smith in your area...
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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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