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A caveat first: All “vom Hofe Super Express” ballistics were published well before chronographs were widely available...........
So in 1955 Gehmann simply copied a prewar experimental cartridge, the 7x66 Brenneke Maximum, and offered it as the 7x66 vom Hofe Super Express.
This case is based on a .404 with a slightly rebated rim. The shorter, but fatter case has the same volume as the 7x73, but can be fitted into a slightly opened up Standard length Mauser action. Gehmann advertised it as providing he same ballistics, a 11 g bullet at 1004 m/s.
Pressure tested 7mm SE vom Hofe loads published by the DEVA don’t even get close. The fastest 170 gr loads don’t exceed 890 m/s = 2920 fps. To break the 1000 m/s within the max pressure of 4400 bar, you have to use 8 g = 123 gr or lighter bullets.

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