Originally Posted By: John Can.
I'm not very knowledgeable on the subject but I was once told by an acquaintance that before the actual term for choke e.g. full, modified etc. were used the above method was used to show amount of choke. A 10 gau. with 11 /12 on the barrels would indicate ( for the sake of argument modified choke (11) and full choke (12). I have a 10 gau. with 11 on one barrel and 12 on the other (modified & full). The same gun is stamped "Not For Ball" which would indicate that the barrels were choked to some degree. FWIW --- John Can.


Now THAT is an interesting theory given that the barrels measure about the same at the bore as they do 9" up the barrel.....