All of these are on the .404 brass based 7x66mm. Nowhere near as much available on the 73 mm case. Some mentions of the 73mm Rimmed, based I believe on the 9.3x74R brass for use in break open guns.

7x66 Vom Hofe Super Express
http://forums.nitroexpress.com/showflat.php?Cat=0&Number=73139&page=0&fpart=all&vc=1

Article by our member dotchicco:
7X66 Super Express Vom Hofe The Chimera.
https://mauserfanatic.wordpress.com/2020/09/30/7x66-super-express-vom-hofe-la-chimera-2/

Another weblink:
The 7×66 SE Vom Hofe
https://revivaler.com/the-7x66-se-vom-hofe/