My most accurate 357 magnum load is using a lyman style 358156 (with the gas chk removed) double crimp groove , Ray Thompson design , it weights about 160grs . Tom @ Accurate molds has it in his catalogue . This bullet crimped in the top crimp groove sitting on top of 7.5grs of WSF , spp performs extremely well in every 357 I have tried it in , and that's quite a few .