.357 and .44 magnum are both revolver cartridges and revolvers are pretty dated when it comes to functionality nowadays. The go-to round for autoloading pistols for bears is 10mm. There are a ton of options now, and you get the added benefits of increased magazine size, ability to mount optics and weapon lights, being able to see what you’re shooting at helps a lot if it happens during the night. Autoloading guns are also much easier to use under stress, as you don’t exactly have to worry about where all 10 of your fingers are when you’re shooting.

This is all without mentioning autoloading guns have less recoil than revolvers, because the slide reciprocates via a spring, which absorbs a lot of that rearward energy