I've shot a few big bears, the biggest was right around 435 lbs field dressed. That bear was 7'-6" nose to tail and was 22 yrs old. He would have stretched the scales a little more if he was healthy but he was missing half of one of his front paws and that leg was atrophied pretty bad. If I remember correctly that front quarter weighed 40-50 lbs less than the other front quarter. Let me tell you 7'-6" is a huge black bear and unless a bear was dragging its belly on the ground and looked like a butterball turkey it would be extremely hard to get over 500 lbs.