[Researcher]

In "correct" terms the Super-Ten was the 2 7/8 inch, progressive burning powder, high velocity, 1 5/8 ounce load 10-gauge introduced circa 1925/6 --

10-gauge Super-X Shells.JPG

Western Super-X -- Winchester Super-Speed Super-Tens.jpg

Super-Ten Ad, American Rifleman September 1929.jpg

and the Magnum-Ten was/is the 3 1/2 inch shell loaded with progressive burning powder pushing two ounces of shot (originally) introduced in 1932 --

Magnum-Ten Top.jpg

Magnum-Ten Announcement 1.jpg

Magnum-Ten Announcement 2.jpeg