9.5x57 MS dies are available from CH4D dies. Brass is available from Bertram with both 9.5x57 MS and 375 NE headstamps. Brass can also be formed from 8x57, 9.3x57 but will end up 1mm short, or 30-06, 35 Whelen or 9.3x62 which will end up the correct length after trimming. Brass is also available from Horneber in Germany.

8x56 MS brass is available form Horneber, SHM and Quality Cartridge Company. Dies from CH4D and brass can be made from 8x57IS. You won't know what bullet to use for sure until you slug the bore, it should be .323"

Waidmannsheil.