The K Frame in that ad is an old M&P .38 Special and NOT a .357 Magnum. Given the older steel and the fact that the cylinder stop notches are directly over the chambers, heavy .38/44 loads are not advised in this revolver and they just might destroy it. In fact, .38/44 type handloads are way too much for my Model 64, which is an updated version of the M&P with better steel. But the modern J Frame is very tough and as previously stated can handle the .38/44 and also the heaviest .38 Special loads.

Dave Sinko