All were successful.
That's what we know about. How many were unsuccessful?
Bear country, I think I'd be gunning up.
I and several colleagues, have been searching for failures for years. We have found four. Here is an article about three, which involved a .22, a .38, and a .357. The fourth failure was found this year. It was a .44 magnum which was used to fire warning shots. The bear did not leave. Neither the bear nor any person was injured. It was scored a failure because the bear did not stop the aggressive behavior after the shots were fired.
If you have any more failures, we would love to see them.