Hallo Grandveneur

I know Harald Wolf well and he has not written the story about the .404 Magnum Schueler.
What have been shown in the Hatari Times article about the 11,2x72 Schüler is only the top of the catalogue sheet.
I am sorry to say, but I have my doubt that you will be able to find a Mod. 34. At least I can try to support you with a scan of that old catalogue sheet that Rolf Ziegenhahn found in the demolished building, just that you know what you are looking for. Let me know if you are interested.

The interesting thing about that cartridge is the modern design – even that the slow burning powders necessary where not available at the time neither the strong bullets as you said!
Furthermore the .404 Magnum Schueler has an L6 (overall cartridge length) of 86,5 mm so it will fit into a slightly modified standard length Mauser 98 action – that is what the .416 Weatherby can not offer….

As I said, just let me know if I can help further.
Robert