Based on what I have been told of this bear, it is a good news bad news proposition on how close you can be. I was told the reason he has two ear tags and the collar is because he has charged/bluff charged humans before. That said, the two days I saw him on Dunraven near the 4th, he seemed fairly docile, although I did not know until after he left that he weighs around 600lbs. On the 2nd, he was kind enough to come fairly close to me, close enough that I had to take the 1.4x off of the 600, and he provided a full face for the frame. I will try and post a picture of him tomorrow, the one I have on my blog doesn't really do him justice.
Just remember, they move fast and they are dangerous. In Yellowstone, YOU cannot approach within 100yds of a bear or wolf, but they may approach you. After my encounter with him being about 15yds away, I realized that had he wanted to come after me, I would not have been able to pull the bear spray, but I was at the front of my vehicle and may have had a chance to get in had he charged, but again, the key was he approached the people watching him, almost no one approached him.