Brown bears and grizzly are bigger. I believe a good average for those is more in the 500-600lbs range.
Brown bears seem to me to be a bit larger than that here; if we are talking adult bruins, more like 700-1,700 lbs. range.
"In Alaska and Canada, average weight can be 900 pounds for males."
http://arktofile.net/pages/bear_brown.html
Did you notice that "Northern" average is close to half a ton?
And the upper end is close to a full ton?