There have been some comments on one particular matter in a confrontation with a bear (Grizzly or Black) don't matter. Obviously it's going to be a tense situation. Both for the hunter/hiker and the bear. So as said, what if the spray doesn't work. Bear spray in a sense is just pepper spray (maybe higher scovial units but I'm not sure) So that being said, you shoot that crap and you better make damn sure you hit that bear right in the face; because you're gonna catch it as well.
2nd was the .40.....To me this is almost a joke. I understand the comfort of a weapon for self defense, but we're talking about a freakin' BEAR here
Thicker hide, more dense fat, etc. Better make sure your on target and able to stay there while the wetness is running down your leg if you're gonna shoot that bear
3rd - Rem 870.....see answer above. Although it does have more power/force, better make sure you're on target.
Although I have never been in a confrontation with a bear, I can assure you that just like any mother (animal or not). Aint nothin' gonna stop them from getting at their babies (which is likely the confrontation you will be in). My advice would be to speak softly (have your pepperspray in one hand), slowly back, walk, do whatever you can to escape the line you're in from the bear to the cubs. If the bear charges you, well, as they say....hit the deck and play dead. May not be a bad time to believe in god at that point either, if you don't already
ONE RULE: If you don't know the difference between a black bear and a grizzly when you're in a confrontation, climb a tree. If it climbs up after you, it's a black....if it knocks that bastard down, it's a Grizz....either way, you're f*ct