Bruce I believe that TPS will tell us .729 is the magical number. However I do not have any 12 gauge guns that actually measure that. The smallest bore that I can find in my group measures .731 in each bore. In looking at a half dozen or so others they all seem to range in the .733 to .736 range. Based upon my selection I would have no issues with the measurements you cited. Some of the guns I cited above are minty and undoubtedly never messed with so I feel comfortable using them as a guide.
|