any one of the three will do what you want & then some. The question I'd be asking myself is which one can I shoot most accurately out of a light weight rifle platform - assuming you dont want to cart a piece of field artillery around the hills.
Every ones recoil tolerance is different but out of the three the 7mmRM is going to be best on that score ime. The 300wsm is not a lot more, but its a much sharper recoil, hence may trouble the more recoil shy shooter. The ballistics and wind drift are going to favour the 7mmRM unless you get right to the top end of big 30cal pills in 300 WM.... then you got more recoil. Personally I'd also try to avoid a brake if possible. I find I can shoot 7mmRM and 300wsm with out brake pretty well, but big pills out of 300WM is a different story. Muzzle blast from WM is fierce. Also consider bbl length and total weight of rig - the wsm & RM you do just fine out of 24in bbl, some would say even shorter if your goal is sub 600. But to get best from 300WM & high BC big pills you really got to go 26in plus brake - that's a pretty big unit to lug around steep alpine country. My recommendation is 7mmRM, no brake & keep it light as you can.
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