I consider the fact that he took down an 800lb bear with a handgun, any handgun, pure luck. Some may think this incident proves that 10mm is a "magic bullet". It isn't. If you have no other choice, sure, go for it. There aren't any better options for you, so give it a try. But don't expect it to work. It did for this guy in the article, but generally, no, it's highly unlikely that a handgun will stop any bear, much less one this size.