John, I have a WW Greener from 1892 that has 13/1 also. Someone before when I first got it said that it was proofed at .719 but should not accept a .719 plug gage 9" into bore.
These bores measure .727, right and .728 left with .009 and .034 constriction.
From what I have gathered it is a Facile Princeps F 16 with the machine turned receiver.

So as you stated it would be good at .728?

This gun has 27 1/8" barrels and weighs 6 lbs. even. What a joy to carry, just have to get used to the side safety.
The thinnest wall thickness is .030" 17" from breech. 5 inches from breech measure .073 and .074. Barrels weigh 2 lbs. 14.8 ozs.

Last edited by JDW; 02/02/14 04:06 PM.

David