If you are considering using a .357 Magnum revolver for bear defense, it is important to choose a revolver that is of sufficient quality and durability. You should also ensure that you are using ammunition that is specifically designed for bear defense. Finally, it is important to be proficient with your revolver and to practice regularly so that you are able to use it effectively in a high-stress situation.
Bear spray is widely considered to be much more effective than firearms as deterrent, as bear spray has a far great range then any handgun as well as having a faster reaction time for use.