Plentycoupe: May I make a recommendation? First make a decision on what gun you will be using. Get a good rangefinder, (I recommend a Loupold with Inclinometer) trying to estimate range in the mountains can be difficult, as can elevation. Then go to the South Cushman range, start at 100 yards, and work out to 300. Sight the gun in for dead on at 300 yards. Then start shooting 4" clay targets off the bank in back. When you can bust those clay targets regularly your ready for sheep hunting. Yes I'm a tough task master, but I've came back with fellows that blew a 250 yard shot due to not enough practice. I've also talked to guys that shot all their ammo at sheep that were over 700 yards out and they felt they could hit them. I personally blew a 125 yard shot due to elevation. I shot right over the sheep's back not realising it was higher than I was.
It's 337 yards from the benches to the berm at South Cushman. If you want to try shooting farther get back with me, I think we can come up with something farther if you like. I just want to see you get the trophy of a life time, A DALL SHEEP.