I had a good and enjoyable chat with Rich earlier today. For those of you who haven't had the pleasure, he's a great guy!
Been doing some thinking on this and I think I'm gonna stick with the standard 25--06 and 6.5-06 cases. Just not enough payoff for me estimation with the AI. If cases and dies were more readily available it would be a different story.
The Sherman is a great sounding case but I have also been planning on doing a 6.5 WSM anyway so i wont duplicated the ballistics. I think I'll eventually also do a 25 WSM which should give the 257 Wby a run for the money.
Thanks a ton for all the help and good shooting