I have shot a few bears in my life ,, some over bait .. some over dogs and one that was too close for comfort .. the bear that was close was a big one .. 652 pounds .. I had a 300 win mag ,, That bear took a 300 Mag and did not fall off it;s feet .. it was going no where of course .. but walked about ten feet before falling ; I chambered another round but did not need it .... A 357 and bears should not be used in the same sentence when it comes too self defense.. If you are shooting a treed bear a 357 will do the job as you have TIME too get a head shot .. If you are over bait you will have time too get a proper shot and over bait you will be shooting 40 - 50 yards at most .. if you are being charged .. that 357 is not enough in my opinion .. If you get a Head shot .. you may be fine ,, But if you do not .. the out come will not be good ..
There was a large bear about 20 miles north of where I live .. he was marking Hydro poles as high as i can reach and higher ,, He got too not fear humans and would stand right on the road and people would stop because he would just stand there .. One evening a hunter that was deer hunting was walking out and walked right into this bear .. he was armed for deer and shot it because it was getting aggressive. so this was close too dark .. a big bear .. and it was not acting nice .. I talked too him and he was glad he had a big gun .. As stated before .. the chances of having a bear encounter is slim because they will run away most often and a 357 is better than nothing ,, But there is way better choices for sure