I'd say use at least a 500gr arrow with a scary sharp 2 or 3 blade broadhead, 600gr would be better. Like others said study bear anatomy and make sure you can put the arrow right where it needs to go.
I've only eaten bear meat a time or 2. It tasted like greasy beef to me, not bad mind you, just a little different. Save as much of the fat and render it down to bear grease. It is excellent for cooking, leather dressing(mixed with other stuff) and to hand rub into your next primitive bow.