Shot placement is paramount on bears. I could repeat this 10 times and it wouldn't be any less important. I've shot 3 bears, all double lung shots and all went 60 yards or less. One with 3 blade razorcap, 2 with Zwickey 2 blade Delta. I've been with a friend on hunts and his two bears killed went 50 yards or less, same double lung hits. Look at bear anatomy posters on the top of this forum. Make sure you have sharp heads and low shot angle if hunting from tree stand (when baiting, many stands are close to the bait, so if you get to high, you risk missing the solid two lung hit). I've not seen any of our stands higher than 10 feet at the base for bears and preferably in a pine tree for cover. If you are hunting over bait, let him commit and take a relaxed shot. Let yourself calm down. I've taken 1 bear stalking in Montana and 2 over bait. All were broadside or slight quartering away, which is a good shot angle. Penetration is not an issue on black bears. I personally like three blades now, but that's only a personal preference. Four of the recoveries I was on were Zwickey Delta 2 blades and they were all short.
Shot placement, shot placement. Good luck and have fun.