Not an example of using a gun, but this wolf did not seem deterred by confrontation and repeated shots of bear spray to the face:
http://www.montanaoutdoor.com/2013/07/wolf-attacks-bicyclist...
http://www.montanaoutdoor.com/2013/07/wolf-attacks-bicyclist...
People going into environments like that need to carry guns, and they need to understand that running away, especially in a panicked manner makes things worse. I'm not saying they aren't dangerous animals, they clearly are. That's why people need to understand how to handle them, its no different from being prepared to climb a mountain.
But hyperbole about needing a mini-gun or you are surely going to die to a pack of wolves is just utter, complete bullshit.