The coat on a bear is fairly long. Allot of times it can be 3 to 4 inches long so don't let it fool you on where you think the bottom of the bears tummy actually is. The lungs on a bear are a tad smaller then that of a deer but don't aim any different then where you would aim on a deer. I've shot my share of bear and I've aimed just like I was aiming on a whitetail and most shots have been double lung hits. Good luck.