Trapper
Bears must be different in Canada as it matches my Black Bear skull pretty closely.
It is an old skull for sure. The entire lower jaw is missing. The bridge of the snout has sunken and a little different from my complete younger Bear skull.
I will print out the picture and stop by my Taxidermist on the way to dinner tonight. He probably does more bears in the state of Montana than anyone and has at least 50 in his shop on any given day ready to be shipped out.
It's my opinion that it's a old Bear that has been disfigured by the elements for sitting so long.