My rifle functions very well with 158 gr. JSP's designed for the 357 magnum. In fact better on average than Winchesters 180 gr. Power point factory load. I would like to get a 180-200 grain GC mold with as wide a flat nose as possible. Probably going to try to keep velocities in the 1900 fps area so even a bit more weight won't hurt anything. Well I posted before I looked deep enough in the forum.