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.
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John Stuart Mill."