I'm at 791-794 with jsb jumbo exacts, I went through about 15 mags to find a sweet spot. I'm running 2200 through a 500cc tank, running a drop block from the c88 plenum. I chamfered the opening in the part66 port. (Did before the tank) wanted to see what 2200psi did to my velocities before I ported. I can get mid 790s with jsbs but got an absolute high velocity with 15.89 barracuda 15s of 831. But that was before i found that perfect little notch on the hs. That keeps the SD around 4 FPS. And jsbs and Cuda 15s in altoid sized groups 25-35y. With the tune the jsb are between 791-794 as I stated and the cudas around 806-811, i tried the benjamin single dies this week. None too impressed. Maybe the original barrel would do better with them. I put the 380mm Fx barrel kit on it with an stx superior liner. So if there is 50-75 fps to be gotten I'm doing it. Thanks.