I'm not too fond of the 30-06
Blasphemy right? Couldnt tell you why really...personal preferance I guess.
The field positions when shooting is always a good idea for practice since you cant always have a bench in the field for that perfectly stable shot not to mention the recoil dampening affect.
I like those numbers for the 338 Win Mag, if I were to get a bolt gun (which probably will happen in the not so close furture) I think I'd go for what you have there with a more personalized stock for myself.
But I really think I may end up going with the R1 in a 300 Win Mag in the end for my next rifle, the more I look at it the more I see it has over the BAR. I'm not saying a BAR isnt good, I just like the way the R1 seems to fit better for me.
I would go for the BAR if it had more upgrade available, but it seems like what you get from the factory is what you're stuck with...