Found some more info on web about WS1 chokes. I quote:
" I think I've found Winchester's patent filed in 1933 and granted in 1936 for the Winchester skeet choke. It wasn't based on any certain constriction or bore diameter. It had to do with a certain taper boring of the choke"
You can see the taper after the constriction area the taper goes to the end of the barrel and is larger than the bore diameter. I know Beretta copied the ws1 choke in a choke tube they made, I had one.
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