Quote:
(in which case an AR10 type is always the frontrunner to me, and in .260 not .308
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Agreed, I would take .260 (or 7-.08) over the .308- but good luck trying to find one- or even a barrel in .260.
Also, if the OP doesn't handload, the .308 would be a better choice IMO.
Very little in the way of .260 factory ammo, and at his max range of 500 yards the .308 is more than adequate.