Just my opinion, but 4.5-14 seems GROSSLY excessive on a .308.
I believe a 2x-7x would be more magnification than you'd ever need with a .308. and the lower powers will be much more forgiving, not only of eye relief, but of mirage as well. Just a thought.
I use a 1.5-6X42 Swarovski on my .30-06 hunting rifle, and I've never felt the need for more magnification, even hunting Pronghorn Antelope out here on the open spaces of Eastern Wyoming.
And I looked, and behold a pale horse: and his name that sat on him was Death, and Hell followed with him. And power was given unto them over the fourth part of the earth, to kill with sword, and with hunger, and with death, and with the beasts of the earth.