"Dude has no idea what he is talking about."
Notice that I said ".357". The 60, and all the J-Frames were .38 only for many many decades (not even .38+P!). The SP came out in .38+P, then later in .357, and S&W realized it had to do something to keep up. They discovered that if they heat treated their steel guns, they could greatly increase the strength, and so the steel frame .38+P and .357 J-Frames were born. While there were indeed airweight aluminum frame .38's back when, it was only with the advent of the aluminum/scandium alloy, did they come out with the ultralight airlight and airlight Ti models rated for .357..