Does any one know if the Critical Defense .357 mag, 125 gr. would be OK to shoot out of an S&W k or J frame revolver? Would it harm them as other 125gr. 357 can near the forcing cone.
check the velocity. If it's a hot 1450 fps./4" barrel load, then yes, I would think it would be possible to damage a K frame (split forcing cone) with excessive use.
I would just run something heavier, or use 125 gr. ammo sparingly.
