A winning combo for light weight and superior accuracy in a "light weight "hunting rig for work at high altitude,would in my opinion be as follows.
Action:Remington titanium or after market clone.
Barrel:Broughton fluted 5C in .264 25-26"
Stock:Mcmillan hunters edge with machined in pillars and full length bedded
Rings/Bases talley 1P/C L/W rings !" low
Optics:leupold 4.5-14X40 A/O with custom BDC
Cartridge:6.5X284 140 berger hunt VLD's @3000fps
Ceramic all over and stainless studs
This combo weighs enough to shoot well from field positions doesn't kick like a mule and hits hard at the longer ranges. see similar package at Cloud Peak Gunworks Home Page