I get 1240 fps with a 155 XTP and Power Pistol in a 4" barrel. That is the absolute best I can get with standard pressure .40 S&W. If I need more than that I take my .357 Magnum! And honestly, with a 4" .357 I can't get 1400 with a 158. 158 gr LSWC I can achieve 1341 fps in a 4"er. That's still...