Not even a question in my mind. I've spent my life in the mountains regularly. I can exert myself below 1k elevation and not even get winded, even after smoking nearly 3 decades. Physical condition IS THE THING. Gun gack isn't going to do any good if you can't get to where the animals are, or do what you need to do when you get there. I suppose if you're hunting from horses with a staff of people who will process the animal after you kill it, the gun/ammo would have a bit more bearing on success, but other than in that scenario, it is the ability of your body to do what needs to be done.
