First off...the .22, 12 and sweet 16 ARE hunting guns!!
Secondly .308 and 30-06 have the same ballistics @ 100 yards. Where the 30.06 starts to shine is when you want to ramp up range and/or heavy bullets.
Originally Posted by brasskicker
30-06 is always a good choice in case you get the opportunity to hunt something else later. That way you won't have to buy a new gun unless you go to Africa or something. I have never hunted hogs but 30-06 might be overkill. .257 30-30win or .35rem would be other calibers to consider. All of these are around the middle of the firepower spectrum of the calibers for deer. I was once told that .35 Remington is the perfect amount of power for deer and is the best whitetail caliber ever made. Dont ask me why that's just what he told me.
The .35 Rem is an AWESOME deer cartridge. My dad and both grandpas carried .35s for deer. Great brush guns!