"Actually I have read that deers prefer to be shot with a 30-06, thus explaining it's popularity. The deers want to be shot by it."

That's just due to habit. The old '06 has been around for over 50 years longer than the .308 Win., and deer have become accustomed to being shot by it. I believe this explains their preference, since deer are creatures of habit.........Now, bears, on the other hand,.........