I am starting to think that the cosmetics and/or the caliber are what defines it, as much as I hate to admit that cosmetics determines a type of rifle (AWB). Like the Barrett .50, purely for sniping. And to whoever said that a hunting rifle will be carried all over mountains and sniper rifle not, a sniper walks super long distances over difficult terrain often to set up their shot. They don't just hop out of the Humvee and take pot shots at a HVT.
Also, I don't know if I agree with Gary above, because we certainly aren't using a varmint rifle to kill moose, and I have heard many a story about some old, beat up 30-06 taking one down, certainly not a target rifle.