My Finnlight m85 300 WSM likes 57.5 g of RL15 with 168 g TTSXs (cci250 primers) - .average 3- shot group is 0.92" at 100 yards (3 of 4 groups went sub moa) with ave. velocity of 3050 fps - not the fastest load but very comfortable to shoot. I've tried Vihtavouri n550 and n560, RL17, H4350, with 168 ttsx and H100V with 180 Etip.
Planning on trying Varget and IMR 4831 next with 168 TTSX next (r
Have run out of RL 15).