Something caught me by surprise tonight . Black bird sitting on top of my shed little less than twenty yards out . My Kral is set to 910fps , I turned the power wheel down to 1/4 figured half inch below zero and POP! It sounded like a firecracker when it impacted . At least twice as loud as normal . I decided to check it out and found that there was no pass through ; it dumped 100% of the energy . 9.57gr H&N Hunter Extreme . Tomorrow I'll chronograph the speed at that setting .