This in my eyes, is what I deem the perfect Sheep rig. Its a Mark Bansner "Ultimate Sheep Hunter" chambered in .300 Win. Mag., Rem. 700 action, Lilja bbl., leupold 2.5-8 vari X-III. Field ready it weighs 6lbs. 2 oz. It shoots 165 X bullets into tiny little groups.
Alot of people feel that they dont need that much power for Sheep, but after guiding in the Yukon, BC, and Alberta for 11 years, I will gladly take a little extra power, than not quite enough. I can say that without a doubt, that in the time I have spent guiding, that the .300 Win. Mag. was hands down THEE most popular chambering in our camps, on everything from Antelope/Deer to AK/YK Moose and Mnt. Grizz., and everything in between.
I will also say that I have a 7mm-08, .280 Rem. a 7mmSTW, and several others. I would use any of the above on a Sheep hunt, but if given the chance to build another "Sheep" rifle, it again would be chambered for the .300 Win. Mag. and nuthin' but!