A lot of good recommendations here. Coming from a 30-06 can I assume you are shooting factory ammo? If you are and plan to continue with your new rifle, then I suggest running a highly popular caliber that you can find the right load that works optimally in your barrel at nearly any store you go to.
Agree with 7PRC, 300WM, 300 PRC, and I am going to throw 30 Nosler in there. It outperforms all of them.
I tend to stick with slight larger calibers that can throw big bullets as a hunting rifle. Yes, 6.5 CM will kill elk and so will a 243, but at longer distances, I want to throw the biggest bullet I can, as fast as I can. It is a huge benefit to the animal....all animals die when you hit them perfectly. Its when at 700 yards and you shoot and they take a step or two, you want a big bullet.
Shooting 200 rounds a year with a magnum is a lot. Bbl life is a relative term based on more than it just being a "barrel" Some last longer than others. I am a custom builder and this is what I tell customers. Narrow it down to the 3 or 4 best options, then pick one YOU WANT - then worry about the rest