200 grain Partition or Accubond:
"Dominion" cases, CCI 200
50.5 grains of Vihtavuori N550.
With the 175 Sierra or the 180 Ballistic Tip:
"Dominion" cases, WLR
52.0 grains of Vihtavuori N150.
Reason I am using the older "Dominion" cases is they have the greatest internal capacity of any case I have seen in 8x57.
Winchester has somewhat less room, and these loads compress unless you can seat them way out.
Regards, Eagleye.