Been in camp when they have gone through at night - between the tents. Those were usually fall hunting camps. I have come upon a young griz years ago on a gut pile that took a while to get our scent and leave. We still BACKED out of there. I prospect on the coast and carry bear spray but depend on a firearm. The bear spray is mostly for blacks. I know there isn't much chance if a griz breaks out of the brush 3 or 5 feet away but the gun would work faster then the bear spray. Also consider wind direction when using the spray. If you surprise a bear it is often because the wind is coming from the bear. I do however feel safer in an area where bears are hunted than say a protected area where they are never shot at. They seem to show more respect.