I could'nt get a hold of a chrony that I was hoping to but I will in a week or so. With the new slightly stronger spring it is estimated around 700-750 FPS. It was very obvious the lighter loads were unstable in flight and were keyholing slightly. The problem with the 40mm trophy is that it sits high on the gun, at 25' it was zeroed and at 100' the pellet was still above the sight line.