Lets remember Superposed 76mm with 30" barrels is a "Classic Double".
Oh, there used to be an outfut out of St.Louis called Classic Doubles that sold "Win 101" and then newly designed sxs called 201. Lovely classic lookers they were.
Some dude wondered whether this new stuff is safe in his pre-WWI Parker Bros. shotgun. I nearly fell out of my seat laughing!
You see, those shells are made specifically for CLASSIC DOUBLES made at old Olin-Kodensha plant that was turned into a golf course.
RIDDLE SOLVED!
PS. I had the 201 and can recommend it w/o reservations. Those O/U they made were superior to most variations of Winchester 101.
