I have been involved with numerous black bears throughout my life time, if they are close enough I talk to them in a low voice. The nearest incident was a sow with two cubs, she bluff charged, went up on her back legs, chomping her teeth while I stood still explaining to her that the 300 WM I was carrying trumped her silly antics. After a few min, she called the cubs down and left. Years later a large Cougar at 17 feet unnerved me also but I was above it and did look large as I am assuming the muzzle of the WM did to the cougar. That one did unnerve me for a couple of hours. Both of these events in Idaho a few miles apart.