I would think twice of shooting a large Grizz with a 357 rifle, unless it was last ditch and no doubt as to a definite attack.
ANY bear encounter I would suspect would best be not shoot upon site if not charging, and hope the bear moves on, but if it is close, very close, it could be a standoff, and running is not a good option.
Pepper spray is said to be effective and might be a great option for many to carry afield. I have seen footage of a bear leaving after sprayed, but we do know that cannot kill them, nor guarantee stopping but likely could thwart continued charge if used correctly.
Personally hope I never face that situation, but preparedness in what you carry, and a plan of action is a good thing.
