Dang it you two (John & Jim)....Stop!!! I'm not changing my build to an 06. I'm sticking with a 300 H&H MAGNUM.
I am having a 300 H&H built also. I will not be changing my plans at all.
It will be real easy to load to 30-06 plus P levels or crank it up if needed.
If I am worried about recoil, I will grab one of my 30-06 improved rifles (aka 270 Win)