I should probobly re-phrase my comment on the Noslers etc. They do work, no doubt about it. And if they work for your caliber/game combination thats great, if fact if I used a 7mm I would shoot that or something similer.
The problem I've seen several times in the past (with 30-06, . 338)is that on a less than than optimal shot (say, through the shoulder) on big game such as moose, the tip blows off in the bone and the rear portion then makes a very small hole through the lungs. Still kills it of course, but takes longer. This is honestly not a real issue for Quebec Caribou, especially with a . 308. We shoot alot of moose in our family though, so I have a warped view.
As for your truck, do you have a block heater installed? I don't know if you will have a place to plug in, but I imagine it gets cold there. It will also help to have a good arctic grade synthetic oil in the engine. Synthetic 5w-30 will do wonders at chillier temps.
Isaac