If I'm not mistaken Jeff, around 1910 Parker Bros would normally have patterned most guns with # 7 or #7 1/2 chilled shot at 40 yards in a 30" circle.
It should be pretty easy to determine what % of the standard 1 oz. charge was within that 30" circle. From that you can figure the verbal choke description... But it looks to me that at lease the left choke has been opened.
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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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