TOOTHandTINE;
Sheephunter has a sweet combination for sure.
The sky's the limit if you are building or having a rifle built.
I have used a Kevlar stocked .270 win or a fiberglass stocked .300 win mag on about everything. However I have given both rifles to a couple of my daughters!
If I were to buy a factory rifle for sheep I would look at a Kimber Montana in 300wsm, maybe a Rem or even a Browning with a synthetic stock for durability. Lots of punch in a small package!
I just built a rifle for me, to replace what I gave away; 300wsm, stainless Remington 700 action, stainless 24" fluted barrel w/o brake, Brown precision Kevlar stock, Talley base/rings, 3x10 Swarovski TDS crosshair. The gun is new this year so I've only harvested 2 animals with it, Mtn Goat in Utah and a deer in Utah. I use Barnes 150 TTSX, Win case, 68 grs RL-17, WLRM primer @ 3250 chrono'd fps. This load shoots sub MOA in my gun. The last groups at 400 yards averaged 3.87" (disclaimer; this load is for MY rifle only. Work loads up using accepted reloading practices)
Opinions are like noses, everybody has one!
Good luck. It will be fun to see what you end up with.