http://www.absc.usgs.gov/research/brownbears/pepperspray/pepperspray.htm
Here's the link that works. Please read it.
Bear spray has much greater range than 10-15 feet and it is far easier to effectively hit the bear with spray than with a handgun.
I'm not saying that I wouldn't bring a handgun. I would. But I would reach for the bear spray first. If there were two of us, one would use the bear spray while the other covered with a firearm.
Exactly...When I hike I always carry a sidearm and a knife along with my bear spray. There are those that would think even that is over the top - perhaps it is - most of my hiker friends go armed with little more than a Swiss Army Knife and a walking stick - though a few have started to carry spray. I just always carry - always have, so the woods is no different...
If you were to hike regularly behind my home - up along the AT and into Beartown SF, you'd likely be in the company of bears more than you realize. They're not fans of us on any level - hearing you coming, will send them going. I advise people who do not want to encounter bears to make noise - bear bells are very effective, (if not a bit annoying)...
Your only real fear should be if you encounter a cub on its own. They sometimes lag behind mom and getting in between a cub and its mother is bad juju. Temptation would be to stand there and say: "aww, cute little bear cub", but your best bet is to back slowly away. If the mother were to appear and charge, continue to back away - the cub will in most cases run to it's mother and the encounter is over. You're fine and haven't shot her and by proxy killed her cub,(s). If in the excessively rare chance the bear gets by your defenses, drop, roll into a ball and cover. Bears - especially black bears, cannot afford to fight. They depend on health to survive and will avoid confrontation, as injury to them means a lower chance of survival.....