Many different combinations will work well in the 300 WSM
. I first found that my Model 70 Winchester would shoot 165 grain Nosler Accubonds and 165 Nosler Partitions very well with RL-19. After this I found that this gun would shoot 155 grain and 168 grain Sierra Match bullets very,very well with RL-19,Norma cases and WLRM primer.
I am now loading 185 Bergers, 190 Bergers with Norma cases, and both N165 and IMR-7828. 69 grains of N165 along with 190 Bergers gave me 2867 ft/sec and very good accuracy.
These are just a few loads that I have worked with. It depends on what you want to shoot. I have also worked up some great loads with Barnes 168 TSX bullets using N550 and RL-17 powders. If you want more specifics let me know.