first time I see the 9,3x62 Magnum label.
imho, a marketing gag in the 1930s like 8x60 Magnum, must have been a thing then. today every second cartridge is magnum, also ice cream is called magnum

so the word is a little bit outworn.
this way most Brennecke cartridges would deserve the Magnum title, the 9,3x64 in any case.

I prefer Magnum Bombe, this is german as possible