Re: Ideal hunting scope for elk and deer
While I can see the merits of having high enough magnification to see if an animal is legal, my first priority is having a low end that gives me plenty of FOV. I do most of my hunting with a 2.5-10 and the rest with a 3-15. If you can make a 3-15/18/20 work for you, then you pretty much have it made, although weight tends to go up.
Other considerations: The ballistics and performance of your cartridge as well as your ability for accurate shot placement, especially considering slopes and wind. In other words, if you're shooting a light cartridge that's only reliable on elk out to 300 yards in the best of conditions there's no need for more than 10X on the high end.