I think we have to go out and measure the guns. Even Schwing doesn't mention choke constrictions. Apparently, there are no published specs for choke constrictions from Winchester. I think your .011 full choke is factory. In my experience, .011 is a lot of choke in a .410. In a Parker shotgun of 28 gauge, .020 was considered full. Winchester's factory chart says .020 is an acceptable full for 20 gauge. Winchester is not known for overchoking their barrels.