I have done a lot of sheep hunting, and usually had a Leupold 2-7 on the rifle. Light weight, bright sharp optics, tough as nails, as demonstrated by a few unplanned bounces and slides down the mountains. Never needed more magnification.
One Husqvarna 4100 in 270 Win carried a 3X Leupold, and even that was plenty. My father-in-law used it at 68 yr of age to kill a really big ram at close to 300 yd. I was right beside him, spotting for him with my binos, and he had that ram down with two quick shots. It was the best ram Hassard's outfit took that season.
Ted