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: