I know another "Bear" thread, but I actually find most informative.
The general consensus is "Gun" over "Spray", which I understand. The Poll on which gun was pretty interesting, the .44 seems to be the caliber of choice and while I disagreee, it is what it is.
The Gun vs Spray thread had a line about shooting a bear in defense at 40 feet, which I thought was interesting. However if you do any reading about Bears and Alaska, all address false charges, many of which bring the bear to within feet before they either stop or veer off. In one book I read the author spoke specifically of Russian River Bears and they're being known for false charges, even multiple false charges. One example the author gave the bear charged him 6 times, once passing so close it broke the fishing pole he was holding in his hand. A gentleman I fished with last year had a bear charge and stop so close that as she was snapping her jaws he could smell her breath.
Soooooo, your fising along the river, when you catch some movement about 60 yards down stream and it's a good sized grizzly by itself that has moved into the river and is looking your way.
You do a hand wave, a couple shouts, but rather then leaving the bear starts walking your way. At about 50 yards, stops, stands, ears errect looking at you. You shout again and he drops and starts loping your way, picking up speed as he gets closer. Head is up, hackles are up, ears are errect, huffing as his front paws hit the ground. You have two fish on a stringer and you move up the bank away from them, however he changes his route, and it's obvious his interest is in you.
Still coming and has closed to 40 yards, you pull your firearm of choice and you start shooting at ____ yards.