Posted by David Williamson on September 12, 2016, 10:10 am, in reply to "#0 10 gauge"
Vance, my 0 grade 10 ga. circa 1907, right barrel is .772 bore with .20 constriction. Left barrel is .768 with .043 constriction. It has Good Damascus, which I believe is 2 Iron Croile. Brother Drew could verify that. The minimum wall thickness is .032 at 20" from breech.
I believe that some Parker 10 gauges had .800 bore. It seems the earlier guns from the Syracuse era had larger bores.
How did you measure for choke? That is the tightest constriction I have ever heard of. Seems the factory forgot to ream them.