I have a few K frames and regularly shoot my handloads at magnum levels and plenty of +P but all with exclusively 158g bullets...never an issue...it's what they are made to shoot.

I also have L frames but I just don't see a reason to go to the hot 110/125g loads in any of my revolvers. A proper .357 magnum with 158g bullets will do anything I need with ballistics to spare. If I need more "bang" than a 158g .357 then I'll move up to a .44. JMHO.