Just like bearklr mentions the biggest thing to avoid is the shoulder blade and it can result in over compensation and a gut hit on bears by a bowhunter...something you'd rather avoid! My best advice is wait for the near side shoulder to clear (mean move forward) then aim for the opposite leg on a broadside, this will put the arrow smack dab in the plumbing and will result in a quick/efficient kill. A quarter away is also a good shot with archery tackle, here take aim slightly behind the front shoulder. All other shots are at best hope and prayers on bear with archery tackle. If you hit a bit far back it will get the liver a lethal shot but one that should not be followed up on until the next morning! I assume you'll be hunting over bait, so a broadside or quarter away shot is very likely and it will probably be in the 20 yard range. Bear do not leave great blood trails due to the thick hair so make sure you watch and listen after the shot and commit to your memory bank. They often do not go far with a good hit but it makes for a less tense track knowing where he went and the sounds he made.

Best of Luck. Where are you going any ways?

Try this link to Black Bear Anatomy PDF
[link]http://www.bowzone.ca/pdf/bearshotplacement.pdf[/link]