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I have heard of the 7 MM Mashburn Magnum, and also a 7 MM Mashburn Super Magnum.

Are they the same cartridges?

I have a Speer Reloading Manual for Wildcat Cartridges, dated 1960. It has 7 MM Mashburn Magnum loads listed. This is where I got the Mashburn Magnum and Mashburn Super Magnum. In one place it is called the Mashburn Magnum, and a page or two futher on, it is referred to as the Mashburn Super Magnum. I have always wondered if they were both the same cartridge.