Rifles are tools.  They deliver bullets.
Bullets:  I agree with the folks who recommend the 7mm Rem Mag.  There are other cartridges that are just fine also.  7 of 8 guys in my elk camp are 7 Rem Mag guys (including me) and we have never had any issues with appropriate kill power.  Do other cartridges work? You bet.  I would stay away from anything smaller than a 270, or anything larger than a 300 Win Mag.  
Rifles:  Non rusting, non wood rifle.  Stainless, Synthetic, Carbon fiber, etc... anything you don't mind getting wet and banging up on the rocks.  I learned this over the years.  I had a nice, glossy Remington 700 BDL and I was hunting in ever-rainy New Zealand.  Water on the barrel all the time, and I slipped in a choked gorge and had to toss my rifle to the rim and grab some roots to keep from being swept downstream.  I nicked the nice stock.  I fixed it when I got home and promptly sold it.  I bought the same rifle in Stainless Synthetic.   It is a heavy rifle, though, so 2 years ago I bought a Kimber Mountain Ascent carbon fiber.  Great lightweight rifle.  It is 6 lb 7 oz, with a 9.5 twist rate.  Once I got it I unscrewed the muzzle brake and put on my suppressor, so as to preserve my hearing.  The trigger comes at about 4# pull; reduce that down to 2 1/2# or so.  A nice Leuplod VX-6 HD on top and I was good to go. For the hunting you seem to want a good Leupold VX-3HD (3.5-10x40) would be a perfect scope (model # 180617).
When you hunt put a ballon over the end of the barrel.  Prevents snow/dirt from getting in.
		
		
	
	
Which durable rifle should you buy?  Your choice.  They are all reliable and will be accurate.
Watch my video on bullets and this rifle on YouTube: