I have taken 3 black bears with a bow. Best advice I can give you is to wait, if you are hunting over bait, wait. All three bears have eventually given me a good shot. But you have to wait for them to settle down. When they come in, look at them real close and estimate the weight. Then reduce that by about 40-50%. Big bears have what appear to be small ears, and there is not much distance between their belly and the ground. Go for the double lung shot and the bear will not go over 50yds. All of mine expired within 40 yards, one within sight of the stand. Good luck!