NZC, we estimated mine at about 225 and the other one at about 250-275.

I have been taught that as an estimate, if the bear's body is as big as a 55 gallon drum he is pushing 400lbs at least. Mine I watched for about 5-10mins and was approx 2/3 the size of the barrel. The other one was probably 30-50lbs bigger.

These bears are from south central Ontario. That would not be the same as the northern ontario and Manitoba bears you guys often see on TV shows. Average size of mature bears in this area would be 150-200lbs. Trophies might get in the 300-400lbs range but are rare.