I know this post is an old one, but I have some info to add on this topic. Here are some tales for you to think on!
I have a place in the Wet Mountains in southern Colorado, and have been spending some time there over the last few years. I have hunted for Elk and Deer in the Sangre de Cristo range across the valley from me. In doing so, I found a pile of scat one morning, just below treeline, that made the hair on my neck stand up. I have lived with black bear for some time, and have seen enough of their scat piles to know what I'm looking at, but have never seen anything of this proportion before. Five times the volume, and still soft. There was also a boulder that had to weigh more than a large blackie that was turned over with claw scratches over it's surface. The drainage I was in was getting very confining, which made me nervous, so I climbed the hell out of there. Even though I had a .338 in my hands, I didn't want to meet whatever made that pile.
Another story from that area just last year, was that an Elk outfitter had one of his mules killed in camp by what he claimed was a grizzly. Supposedly the local warden looked the scene over and agreed with him, but told him to keep it quite.
One other tale is from an old rancher who hunts that area who claimed to have seen a blonde colored bear standing at a distance with all the distinguishing features of a griz.
It is a fact that back in '81, a bow hunter was attacked/mauled in that area by a sow grizzly. He apparently managed to pull an arrow from his quiver and repeatedly stab the sow which was on top of him, until she died. He made it out, and after a couple of years of reconstructive surgery lived to be prosecuted by the DOW. They didn't believe his story apparently. The DOW commisioned an extensive survey, to look for evidence of Grizzlies in the area, but after two years of effort, came up empty.
Except for my own account of the huge scat pile, I relate these stories second/third hand, so you will have to draw your own conclusions, however, I don't go into those hills anymore with less than a .338.