For the 9.3X57, there is little (reliable with pressure test) infos except from Norma's manual and old RWS have loads for it. There is the article Diopter is posting, but the rest is Internet stuff, use at your own risk with common sense. Just remember that the X57 is a low pressure round, at about 43 500 PSI (3 000 bars). I also must point that the 9.3X57 is not ruled by CIP, so the only set standard is from Norma loadings.
One can use the 9X57 loads provided in "
Hdgdon's Common European calibers" loadsheet,
but you must be aware that there is an error on this sheet;
the loads vs bullet weight are inversed. When you read 250 grains, you should read 280 and vice versa.
Also, Hodgdon translates the ADI 2206 powder as being the H4895, but in fact, it's the ADI 2206H wich is the correct one. ADI wich is the "Extreme" powders manufacturer, used the 2206 (BL-C2) for their testings.
Anyhow, the 2206 loads are correct to use with the H4895 too. ADI 2208 is the Varget, wich is correct in Hodgdon's table.
https://www.hodgdon.com/PDF/Common European Cartridges.pdf
For the 9.3X62, there are plenty of reliable sources for the loads. Norma, VithaVuori, Hodgdon, Barnes, Lee, Speer, Nosler and Hornady all have loads sheets in prints.