thats a freakin pig ....what makes them bear get so dang big out in that open sage brush ?..... 
I think it has a lot to do with the lack of pressure. Not many people expect to see bears in the sage brush so they have a tendency to get old, and big. I wouldn't imagine that it has to do with food, unless they come out of hibernation in the winter to chase the deer and elk that winter in the sagebrush. I know of an area that has a large bear in Kittitas county, unfortunately it appears to be a sow, so I will not shoot her until I can be 100% sure it is a boar.
Brandon