WS-1 isn't unique, Beretta uses the same profile in both their Mobilechoke and Optima systems. All are excellent sheet chokes, but I have a hard time believing that Winchester 'invented' that choke profile. They claim to have, but really? Invented it?
WS-2 is what we would call today a 'light modified'. Nothing more.
An altered WS-1 would seem to make little sense, unless the choke was too tight on a particular gun. The actual constriction of the tightest part of the WS-1 DOES vary. I own a 12 gauge M-21 with a WS-1 barrel that measures .008" at the tightest point. It's the tightest WS-1 on a chart that was posted on 'Mike's' model 21 site. It works fine. Seems like a 'skeet' choke to me. Whoever choked the gun knew what he was doing, at least for the right barrel... Same gun has a .015" WS-2. It is a tad tight for skeet, I just load spreaders for the doubles. 'Poof'... no more target. The only time you need or want any choke in the second barrel is for doubles on 4. Why did Winchester choke so tight on the left barrel?
Reaming a WS-1 to cylinder would seem pointless, but I bet some of the WS-2 chokes have been opened. It would indeed louse up the resale value of the gun, but it would make it a better skeet gun!
