Go with loading 8mm. I have been using it for years and have taken muley's and antelope all the way out to 400 yards. If you go this route I recommend both the Hornady 150 grn SP and the Sierra 175 Pro hunter, both over 50 grains of Varget. I also recomend neck sizing your brass. This load also gives me consistent 1" groups from bench rest at 100 yards in each of my K98's.