Mr. Keith damaged or destroyed a number of firearms developing some of those loads and S&W used the N-frame for the development of the 357 Magnum. The K-frame 357 Magnum was developed as a smaller and lighter carry sidearm at the behest of Bill Jordan. The K-frame was intended for occasional use of magnum loads and certainly not for loads that push the pressure envelope to or beyond those established for 357 Magnum.