One thing I want to say is use the 165 grain, it has a better Ballistic Coeficient (shoots flatter), I've used the Nosler B-Tip and it does a lot of damage. The Serria Gameking is a soft bullet and will have some problems as well but it is a great bullet for 308 and 30.06 at about 2700-2800 fps.
Hornaday SST, and Swift Scirocco are the only 150-165 I would use for the 300 Win Mag or WSM. I use RL22 with 77.1 grains and get 3200 fps with the Win Mag.