Don't be so worried about a big pissed off bear coming at you. About all you have to worry about is getting between a sow and her cub or cub's then things can get serious. And then you just need to back away slowly from the direction you came in from talking to the bear in a calm voice, 99% of them are going to run like heck at first sight or smell of a human. Our main outfitter/guide only carried a single bit ax for protection most of the time. Only one year did she carry a rifle and that was a year the berry crop failed and bears were protective of their bait sites and her husband thought it was a good idea to do so. I have had one run in over the years of hunting them up north and that was when a youngster got curious as to what that blob was up in that tree stand (their eyesight is much like a pig not that good) and climbed up the ladder to check it out. As soon as it's nose cleared the edge of the stand I gave it a swift kick in the nose. It fell off that ladder when it tried to grab it's nose with both front feet, last I heard was it breaking brush for 100 yards or more getting the heck out of dodge never to return the rest of the hunt. I have had a couple circle the stand site popping their jaws in warning if they got wind of you but none came close. Hunted some very thick swamp type stuff and one 25 to 30 yards away was hard to see. Easy sound to make yourself, take a empty coke can and smash it with one hand several times is the best way to describe the sound.