So...in this case it was originally under-bored (13) and as they drill the barrels and develop it into a 12 gauge some of the steel is removed? Makes sense - If it is over-bored like you Sauer what do they do? Add steel into it? I don't get it?
Anyway...what I was wondering actually was ----- if it is common practice to indicate original bore size on barrels - obviously English, apparently German - any other countries? What period of time specifically...?
Thanks

Last edited by LuisHunter1; 08/03/13 07:07 PM.