I agree 100%....except you are absolutely wrong.
Black Bear are thick skinned with heavy layers of fat underneath. They are also heavy boned, with all the loose pieces knit together with fat and gristle. You flub the first shot and let it get angry and you will find out how heavily built they are. I've tiptoed through the laurel and taken a few too many apart to let that one go
That said, if you must use the .357 use the heavy cast bullets, you need penetration on Black Bears, HP will only cause superficial damage, and the bear will then cause you deep tissue damage.