I guess I should have stated that with this gauge, you zero out the dial using the supplied .700 diameter ring, then when placed in the barrel it read .051, so effectively .751 as a starting point.
Quote:
Originally Posted by Rick Losey
29 thousands is a full choke
four inches of taper in a choke is not unheard of
as for charts - pick one
https://www.bing.com/images/search?q...tion&FORM=IGRE
but I am confused - a modern nominal 12 gauge is .729 - older Parkers were often a little over bored
are you saying that 4 inches from the muzzle - the bore diameter is .051? |