Most big game hunters use a 3X-9X scope; unless they only hunt dark timber (in which case more often a fixed 3X or 4X is better).
Varmint / predator hunters want a little more magnification (12X or 24X at the high end).
I use a 4X-16X on all my rifles, only exception is my dedicated varmint gun (6X-24X).
Always set out with my scopes powered down to their lowest magnification........................I power up on a need be basis !