Unless you are Elmer Keith you sure won't be shooting at 200 yards with a 357.
Well, call me Elmer because I shoot 200 yard targets with my Marlin 1894C in 357 Mag. Out of said carbine, the old 357 mag equals the 357 Remington Maximum out of a T/C Contender.
Still, it's not my first choice to stop a charging bear.