Back when I was chasing bears a lot, I'd look at between 35-50 different ones a year (all spot n stalk no baiting). During those days I felt pretty comfy in my assessments. I was only interested in mature males, that would go 19" plus and square over 6'.
Of the 35-50 that I would look at during the course of the year normally one to three of them would meet what I was looking for. Course getting on them is another deal
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All that said is to say that bears are incredibly tough to judge for body size (squaring), sex and size of skull.
From time to time they could still fool me, the good deal is/was I just didn't care if I took one or not so I spent a lot of time sizing them up.
I do love watching and studying bears, I've been a crazy mad student of them since 1982.
Memtb, your wifes 5' from nose to tail bruin is more than likely the average bear taken in the Rocky mountains on a yearly basis. Side note, a shot of the sticks at 378 yards is a hell of a shot on a bruin.