What game in mind?
I'm one that believes a rifle can be built too light. A 6.5lb all-up rifle (w/ scope, sling, rounds) is the least weight for my wants/needs, and I'd always take a muzzle heavy rifle with something like a no. 2 contour @ 22".
The cartridge is essentially meaningless among any standard .473 SA rounds. The 100 fps of an Ai translates into little meaningful gain and more hassle.
The standard 308, 7-08 and 260 are basically equals inside 600 yards, with the nod to the 6.5-08 for less drift. As always, the shooter makes the rifle, not the reverse.
Pick one that speaks to you, but I'd not bother with an Ai anything of those you mention. Push to shove, I'd go with the one with Lapua Brass availability.
