UP Powers, that bear in your pic is also walking with front leg fully forward and back leg fully back, making it look longer I think than it may really be
here is a bear that I had in my yard this spring, got his tag info and ran it, he was 595 lbs in May of 2015 when they relocated him
so, odds are he is all of 600+ lbs right here, was a stud of a black bear, estimated at 18 yrs old) and come this fall before he den's its very likely he is a 750+ ish bear
and he was NOT the biggest I had here this yr, had a much younger bear here that made him look SMALL
here is a few pic's of him, and then him with a HUGE female he was mating with, also in my yard LOL and she is all of 350+ lbs, she's been coming to my yard now about 16 yrs, seen her raise 3 maybe 4 litters of cubs,(ran her 3 off for mating season this spring)
a long time local bear, I have a lot of history with!
I get a LOT of bears here on a regular basis, Bears are just one of them animals that even a slight angle or body position, can make them look a lot bigger than they are , and I say one of the hardest animals to truly get good at guessing there weights on
been about up close and personal with a few hundred bears over the yrs, and I still can struggle at times to get a GOOD honest assessment of there weights