9X57 is a much lower pressure rating than the .35 Whelen.... CIP's rating is 2800 bar (40 500 PSI).
Look here for reloading datas;
You just need to be aware that Hodgdon people made a transcription error when they copied it from ADI;
you should instead read;
250 grains / H4895 (AR2206) / 45 grains / 2250 fps
250 grains / Varget (AR2208) / 49 grains / 2250 fps
280 grains / H4895 (AR2206) / 41.50 frains / 2100 fps
280 grains / Varget (AR2208) / 45 grains / 2100 fps
You can use .358" bullets in the 9X57, but be cautious and work you loads safely; the bores sizes are not consistent.