Quote:
Do you think that .011 is the standard that Winchester used for full choke in the Model 42?


It looks like it was original on this gun. I had it measured by a professional because my bore mic at the time would not work in a .410. Eightbore's comment that Win was not known for overchoking their barrels is consistent with my experience. My Mod 12's all seem to have less constriction than the barrel stamp would lead me to expect.