While rafting in the Brooks Range I have had them visit my camp at night as I slept. They never bothered things, just sniffed around and quietly left. Next morning we would find their tracks on top of ours. One knocked my tent down several years ago, not far from the cabin. This bear stepped on me causing me great pain. I was unable to walk for two days after being stepped on.
One charged as I was gutting a Moose in 1986. I never saw it coming, my wife never said a thing, she just started shooting. She shoots a 30-06 semi-auto. She shot fast, the bear rolled on the 9th shot. She took the 10th shot, dropped the magazine, reloaded and shot three more times. When asked since it dropped on the 9th shot, why did you keep shooting? She said "It was still wiggling". When I skinned that bear, it had 13 bullet holes in it. All in the chest, neck, and shoulders. She was using Barnes 250gr bullets.
Jim Shockey the Canadian hunting guide and muzzleloading expert, went after an Alaskan Brown Bear. He filmed it, and I will never forget seeing him running for his life, as his guide shot and killed the bear. All the muzzleloader did was cause it to seek revenge against Shockey. He said he will never do that again, and advises no one go up against one with a muzzleloader. Grizzly and Brown Bears are the same bear. Brown bears live near the coast and eat a high protein diet of fish, where Grizzlies live in the interior, and don't grow quite as big. They are still just a tenacious.
No way in the world I am going into a cabin with a live Grizzly inside. Not even with a Barrett .50 cal BMG semi-auto in my hand.
Next week if no new tracks show it came out, I am giving that cabin a wide berth. The old cabin is leaning, we have been thinking about knocking it down and rebuilding it. A few guys say I should just take a stick of dynamite, throw it against the east wall and let the cabin fall in on the bear.