Here is the reply from Hornady.
Steve, thank you for the inquiry. The 150 SST for the 300 Savage was designed to expand at lower velocities than the standard 150 SST. I would not recommend using the 300 Savage bullet in the 308 Win or 30-06. They are not designed to be run at those type of velocities. I would stick with the standard SST bullet for the 308 Win on up. Thank you
Now we all know.
Thanks for the reply Hornady.