I have been calling high alpine black bears in the blueberry patchs for about 6 years now. The area we hunt you can see up to 3-5 bears feeding in the same general area in the mornings. I have found that in this area with so many bears only the BIG boars will come in. We have watched small bears take off at the sound of a call. Watched one BIG,BIG boar walking away acrossed the canyon in the evening at over 900 yards with the glasses, at the first sound of the call he "puffed up" and looked back over his shoulder as of to say "who is in my kitchen" and took off on a dead run for us. I was hunting with a contender at the time and wanted a shot at 100yards or less. Once he was in the bottom of the canyon (about 150 yards) he circled around in the timber just like a coyote and we never saw him again. In area's that hold alot of bears I think you can scare alot away, but if you do get one to come in he will be a shooter. Plan on calling for at least an hour with a fawn bawl or rasppy jack, calling constantly. By no means a expert just what I have found in my area. Hope this helps.