The training session in Lilhunter's post is interesting and a good guide to tell the diffference between blackies and grizz. The other guys also made some very good comments. Another way we use to tell a large dominant bear here is the posture when walking. The larger bears usually have a pronounced swagger or sway, and will walk with their head low to the ground. A smaller less dominant bear will carry it's head high and often "shoulder check" while feeding or approaching an area. Size is also relative to where you are hunting and the genetics of the area. A 350 lbs boar where we live would not be considered all that big, where in other places it would be. If you ever hunt Vancouver Island on the west coast of Canada, you'll notice that the large boars have a shoulder hump similar to that of a grizz. There are however no grizz on the Island to confuse them with.

T.