My wife's caribou just fell to a .308 from a sub-six Montana on Friday. My strong advice is to search the thread "Montana Tinkering" on the 24hr Campfire IF it doesn't already shoot well. This is a great deal and can be even lighter with the alloy trigger guard, titanium bolt handle, and Javelin bipod if you need to customize it further.
My little brother has the Mtn Ascent in .308 and it is even lighter. Both shoot well for the lightweight platform that we are lugging up Alaska's mountains. If you want to bring a 12lb canyon rifle or a big bore boomer then work on weight loss and develop long range confidence. Show pics after your range session!