Sometimes I don't think there is anything anyone can do; gun or spray or anything. I work in forest development and know a few people that have been attacked, and I had my first full on charge by a blackie sow happen last week. My dog charged it, and they tangled for a second while I got my spray out. The sow ran off before I had to go try to spray it and my dog was unhurt. it happened so fast that I might have just had my spray out if my dog wasnt there, and that was from 30m or so. I know I wouldn't have pulled out a defender, chambered a round (because i'm not going to keep one in the chamber for years on end with the barrel pointed at my butt), and then point and shoot....never would have happened in time. I'm not 'hunting' them while at work, so my mind isn't on them all the time. It took me a second to realise that there was a bear running at me, and that I had to get my spray out and yell. It takes longer than one would think to process all that information. I was lucky there was enough distance between us to start with. She may not have touched me anyways, but i'll never know!