The above round is what I carry in my J frame. I used to think that I had to use 357's in a two inch barrel. I then found the gel testing for the above load. It penetrates 11 inches through all barriers except for dry wall which is 10 inches. I don't think I'll ever have to shoot through dry wall so I say 11 inches through any barrier that I would come up against. The above round has also had excellent street results in LAPD and NYPD. It also is a pleasure to shoot from my 642. 357's out of a J frame does not allow for quick follow up shots. I had this experience with my old M&P360 that I sold. I train with double taps, and would not count on any one shot stops. I think you should consider an airweight J frame with the 38+P's above because you would seriously cut down on your carry weight.