With a Bow, I don't take shots past 40 for penetration reasons. I like clean pass throughs with 2 nice big holes to bleed that critter out nice and quick. I practice with Bow at ridiculous yardages to increase my confidence level at the yardages I set for myself for hunting. I look at it like this, If I can hit my mark consistently at 70-80 yards then 40 yards is a chip shot and one that I know will 99% of the time pass through cleanly and not with the arrow hanging in there plugging up the hole somewhat. With rifle there are just too many variables, including animal behavior, for the AVERAGE hunter to be taking shots past 400 yards.
The original OP was asking about the differences between the 30.06 and the 300WM at ranges 400 yards MAX that he hunts at. At his SPECIFIED ranges the answer is, there isn't enough difference between the 2 to constitute the expense of a 300WM in ammo and recoil increase.
And RR, I answered your little "challenge" the other day in PM so's not to hijack the thread.