I live in Hinton, Alberta, and hunt sheep every fall. I've hunted 'em from horses, driven quads to the boundary of a wilderness area where I hunted them fast and light and I have carried 55 lb's of gear on a 7 day back pack hunt on multiple occasions. I haven't tried the black ops parachute thing yet, who knows maybe some day.
I own a Sako Finnlight in 270 WSM that shoots lights out, collection also includes several Kimbers (84's, 8400's),a Remington stainless 700's, several Sako L579's and Browning Safaris. The latest adds to the safe include a Model 70 Jack O'connor and a Weatherby S2. I'm a mauser nut (except for the Sako's and Wby of course). My fast and light gear is (Kuiu, Sitka, Western Mountaineering, and Mountain Hard Wear). My horse gear consists of canvas pyramid tents and wood burning stoves and cots...hey you are on a horse live it up, eat well, sleep well (best way to hunt sheep btw). Now that you know my experience level and gear choices let me ask you a question...
How are you planning to hunt for sheep? Do you plan on going out once in your lifetime, or more often? Do you prefer wood stocks or plastic? How many times are you planning to shoot at the sheep before you kill it (follow up shots)? And how much friggin' money do you want to spend?
You can drop $5 K on a custom, or $650 on a Ruger American rifle, with weaver mounts and a Leupold Rifleman 3x9 scope. If you want to stick to factory offerings and want a reliable rifle that shoots well, and isn't a lot of moola go with a model 700 Remington stainless, a Tikka T3 Stainless lightweight or a Weatherby S2 stainless in a moderate recoiling calibre like .260 rem, .270 win, 7x57, 7mm-08,.284 win,.280 rem,.308 win, or .30.06. If you want to spend more, Skip the Kimber's. I'm on my 5th, three have been real duds, and I mean duds from extractor problems to crap accuracy (3" groups at 100 with premium factory). Look at Sako A7, Sako 85's (nothing personal to your Ruger and Browning x-bolt guys, I just don't like them), and if you want to spend quite a bit look at Nosler 48, Weatherby Mark V ultra light weights, and HS precision. After that have someone build you a gun with an action of your choice, a good barrel i.e. Ron Smith and a decent stock MacMillan, and trigger, etc.
We have our fair share of grizzlies here in the high country. I see them every year, but they typically stay away (its high country, they can see you and you can see them unless you are bushwhacking to a different drainage and can't stay on a contour to get there). Now if you run into a sow with cubs at close range you're done for it any way so toss her the salt and pepper shaker out of your back pack and hope she goes for the back of your neck first. Message is, pack what you want don't worry about bears.
Personally I would stay away from a .300 WSM unless you buy a gun with the right size action, by this I mean don't buy a Winchester Featherweight or any other gun where the manufacturer uses a long or magnum sized action on a short action cartridge. Buy a gun with the action specifically sized for a short mag so you can reduce the weight of the gun through the appropriate sized action. Also, short Actions are stiffer, and therefore the accuracy should be better. For all those guys out there that say a long action allows you to seat bullets out farther I have yet to see it. Manufacturers building short mags on long actions are typically putting blocks in the magazines, and shortening the followers, cheap short cuts.
I wouldn't buy a WSM if you like to reload (as I do). Reason being, is that the only powder that seems to get the velocities that factory ammo produce is the new Hodgon Superformance stuff (If you can git it). They can be tricky to hand load to as well. Load data is still a bit iffy in some of the manuals.
I've shot my fair share of bighorns, all with a .270 Winchester loaded with IMR 4350 and 140 Accubonds or 130 Nosler Partitions. Every sheep hit, dropped immediately or got up and ran dowhill 40 yards before falling over.
Personally I like a rifle around the 7.75 to 8.25 lb mark with a slightly heavier contour barrel (weight includes a sling, ammo, scope and mounts). They point better in my opinion, especially when you are winded (like in sheep country). The .270 is great for felt recoil (pretty light in comparison to a .300 Win mag) and the light recoil allows you to watch the bullet hit at moderate ranges i.e. 300 yards. I will admit a lighter gun is nice to carry though (but not nice to shoot especially in magnum calibers) it's all a matter of preference. In 2001 I packed a 7mm Rem Mag on a back pack hunt. That gun was in the 9 1/2 lb range. It was too heavy, and I wanted the extra pound and a quarter of food in comparison to the extra pound of weight that was on that 7 mm. After that I went to a 7 pound blind magazine model 700 stainless with a pencil barrel and killed a 180 B&C Ram. It was nice to pack and the rifle has a place in my heart as the plastic stock saved me from slipping over a ledge to an imminent broken back.
You never asked about optics, but I prefer a Leupold 4.5 - 14 x with AO for all my sheep guns. Price is up there, but the eye relief and power range are super nice for zapping a sheep on an opposite rock outcrop 400 yards out. The eye relief on the Leupold is especially nice when you shoot uphill on a steep angle, the more distance you can put between the top of your eye brow and the scope bell the better. I've seen guys with .06's shooting on steep uphill angles get cut wide open on scopes that have 3.5" of eye relief (your usual B & L 3200/4200 for example). Now back to all the keyboard quarterbacks...
The NOZ