Longshot will definitely get you higher peak velocities, but it will also get you more recoil for the same velocity. I believe this graph is from a 9mm test, but the same tendencies are likely to show up in 40, which operates in similar pressure and velocity windows to 9mm. The green line is Longshot. The red line is 231. The horizontal axis is velocity, and the vertical axis is mechanically-measured recoil. LS's no bad, but eyeballing the graph, there's some difference. This may not matter to you in some or all applications.