I’d probably try some 200 Accubonds myself with H4350, RL17, RL16 or RL26 and see what comes out. That 9 twist should keep them spinning pretty fast and expanding well to at least 700.
Sounds like a sweet rifle, congrats.
Scotty, honestly, would you pick the 200 accubond over something like the 175 LRX? From my experience, the 300WSM isn't a screamer. Sure, it will push a 200gr bullet, but its a known fact that the 200 really interferes with case capacity of the short bastid..