I don’t mess around with anything less than 180 gr in the 300 Win Mag. 180-200 gr is the sweet spot for the 300 Win Mag IMO. My favorite loadings are the Hornady 190 gr Interlock and Nosler 200 gr Partition. That’s the special sauce of the 30 cal Magnums. They can shoot heavy bullets fast to better retain energy and buck the wind.