i consider 357sig to be a 9mm on steroids. Looking at specs 38super +P seems to be the middle ground between 9-357sig in terms of fps and muzzle energy.38 Super is a very overlooked round ... It's like a 9mm on steroids ... I own 5 1911 Kimbers in 38 Super that are probably my most accurate hand guns ... I have ammo for it that exceeds the BC of standard .357 ammo ... My only complaint is that no one manufactures a heavier grain bullet like they do in 9mm in the 147gr range ... Heaviest ammo I can find is 132gr !