In the thirties Winchester developed a choke for the first barrel of skeet that was shaped like an hour glass. So it would contstrict and then get wider. It was designed to spread the shot on the first barrel. It was designed for cartridges made with fiber wads and no shot cup.

In regard to the "13" stamped on your barrel flat there is a chart that gives the bore diameter range for "13". I don't have it.

Best,

Mike


I am glad to be here.