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Old November 7, 2018, 06:24 AM   #20
Senior Member
Join Date: December 20, 2008
Location: Somewhere on the Southern shore of Lake Travis, TX
Posts: 2,603
I come up with 8.7 gauge.

Bore diameter to gauge=(1.67/bore in inches) raised to the third power.
Hanlon's Razor
"Do not invoke conspiracy as explanation when ignorance and incompetence will suffice, as conspiracy implies intelligence and organization."
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