I use a pair of 10x42 Kahles Binos. That covers most of my hunting. But this year I spent 18 days hunting Desert Bighorns and gained a new appreciation for a quality spotting scope as the binos just didn't have the power to do the job. Granted this is a different kind of hunting, But I think I learned some lessons from doing it. I will use a spotting scope some of the time. Probably won't carry it with Binos, Rifle etc. But would use it to scout and find game or when I can pack it on a Horse or ATV.

Evening looking for sheep I rarely went beyond 30x power. I had borrowed a 20-60 Swarovski. When I'd try to use the 60x to zoom in on a distant ram, 'd find too much heat rising to distort the image. So i would suggest that a 15-30 power would be just fine. The Nikon fieldscope 13-30 ED is very compact, lightweightand highly rated in reviews.