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I would like to hear more about the 8x75, perhaps in a Mauser forums new thread? So it is based on the .404 Jeffery, or the German version the 10.75x73. How doe sit compare ballistically to the 8x68S? Which came first? etc.
Edited: Or is it based on the 9.3x74R as is the 8x75R? Which would be lesser ballistically than a case based on the .404.
Interesting the 8x68S can use the same bolt head as the .404 Jeffery. I have never looked at case dimensions to see how different or similar they are.

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Apparently there is some confusion about two now obsolete cartridges shown in the 1934 DWM catalog. One is the 9.3x70, maybe developed by W.Brenneke, predecessor of the 9.3x64. This one was based on a shortened .404 case indeed. The catalog shows these ballistics: 231 gr at 2970 fps, 262 gr at 2890 fps, 285 gr at 2890 fps. So it was about 3% faster than the 9.3x64, but required a Magnum length action.
Then there was the 8x75, developed about 1910 by the Suhl gunmaker Burkhard Behr. This was the rimless version of the 8x75R, a necked down and “improved” 9.3x74R with the rim removed and an extractor groove added. Both the rimmed and rimless versions were offered in I = .318” and S = .323” bullet sizes. Maximum 1934 S ballistics: 164 gr at 2979 fps, 185 gr at 2959 fps, 227 gr at 2724 fps. So it was about 10% slower than the later 1940 RWS 8x68S.
Both cartridges had a common disadvantage: both needed true Mauser magnum length actions, much more expensive pre-WW2 and unobtainable after. This is why production was not resumed postwar.
BTW, the base of the .404 is markedly larger, 13.8 mm or .543”, than that of the 8x68S, 13.3 mm or .524”.

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