I always use 158 grain or heavier at or near 1400 FPS in my 357's anything less isn’t a real 357 magnum I never use 125 grain or lighter
I've heard it said that it's the lighter bullets that do the most to damage forcing cones on K-Frame .357 Magnum revolvers.
That seems to be the rumor. When I was at Davis (a S&W depot repair) we encountered several that were from 158's as well as the 125's and 110's. My first handgun was a 6" M19 and my forcing cone split from a 158gr JHP.
So the light bullet thing seems to be the prevailing theory, but I have seen it, and personally experienced it with 158's.
