Just a tidbit of information regarding loads for 9x57R. In opposition to the loads for other rimmed/rimless cartridge pairs (i.e. 7x57/7x57R, etc.) 9x57R seems to share the same loads as 9x57. Since the 9x57 was more popular than the rimmed version, there is a lot more data available that can also be used with 9x57R. Regarding Axel's comment above, concerning not resizing .358" bullets, both a former and my current, as well as a late friend's 9x57 all "slugged" to .358". Also, the RWS listing in the "blue book" shows .358" is the proper diameter bullet diameter (barrels should be "slugged" to verify this).
Mike