Taz, all the advise Nubs gave you is very good but I'd add one more piece of info. The boiler room on a bear sits lower than that of a deer. The most comman mistake and cause of lost bow shot bears is high shot over the lung. I suggest drawing and imaginary line lengthwise thur the bear and keeping your shots just below that line.
A bear with a well placed hit will go down much faster than a deer with and equally good hit.


Work hard and be true to yourself.