I would go 7mmRM, tried and proven, can be loaded lighter and you have the extra grunt if you want it, heaps of loading components and factory ammo anywhere.
I run my 7mmRM quite light, 162 A-Max @ 2850fps, and 150 TTSX @ 2950fps, real easy on the shoulder, easy on the rifle, lighter on powder etc.
162A-Max deadly accurate to 600 (as far as I have used them) using 11.25 MOA, the A-Max shoots exactly 1" higher than the TTSX at 110yds in my rifle so it makes switching easy.
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