I recently purchased a S&W686+ 4" stainless and love my new revolver. The first day I tried it I used some .38 special and said to myself wow this thing feels like shooting a .22 - almost no recoil just a slight push. The next time out I tried some .357 magnum and wow, the thing kicked and I really felt it in my hand. So, my question is how can there be so much difference in these two rounds that are the same diameter and only differ in length by roughly 1/10th of an inch. Both sets of rounds were from the same manufacture and were both 158 grains - so how do they stuff so much more power into that 1/10th of an inch? I looked up the energy difference and the .38spl is rated at 285 while the .357 mag is shown as close to double that at 548.