I also find a huge difference between coastal Alaskan Brown Bears and the Grizzlies in Montana.
Alaska's Brown Bears are most often chilled, laid back and could give a schit about your presents.
Montana's Grizzlies on the other hand are seemingly always pizzed off and looking for a fight if you get within a 100 yards of them.
Food source is probably the difference, Alaska's Coastal bears are fat and full of the endless supply of spawning Salmon while Montana's bears spend their days scratching for huckleberries in attempt to get their bellies full.
Whatever the true reason be, Montana's Grizzlies just seem to have a bad attitude all the time.
This aligns with my experience. I, along with several biologists I have talked to have always guessed it was the amount of food (or lack thereof), but for whatever reason MT/WY/ID grizzlies and I presume those in southern interior Canada are way more aggressive than coastal brown bears, and even interior Alaska grizzlies.
I wouldn't go kick a coastal bear in the nuts or anything, but they're not in the same league as the lower 48 mountain bears when it comes to aggressiveness.
