According to the Speer #14 manual operating pressures for the .300 Savage are held to 46,000CUP verses 52,000CUP for the .308 so I definitely WOULD NOT use .308 data.
We are kind of on our own until more data is available for Big Game but the following may be of help.
I tried 40 grs. Big Game behing the 165 gr. Hornady SP for 2267fps and mild pressures. I plan to increase the charge till I reach a velocity of about 2500fps.
With the 150gr. SST I believe you could start with 41 grs. Big Game and work up to about 2600fps. But that is just a guide and you are on your own. Be careful!
