I've found the Weaver scopes to be absolutely fantastic. In equal length barrels, toss a coin between the 308 and '06. Have loaded for them longer than I like to remember. The 308s I've owned over the years shoot 150 Hornadys and Sierras about 1/4" better than the '06.
In the SPS, you'll get a 24" barrel, so 30-06 would be the correct choice because 2850 with a 180gr bullet leaves the 308 well behind.
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