The highest velocity I could get and still have a bell curve and es under 2% was 910fps. To go above that I have a descending string. My valve was long before Hill came out with an actual .30 valve, so not sure if there are differences between what I have and what his .30 valve is? Mine does sip air though. Almost any tune I only use 700psi instead of the typical 1000psi. I thought about getting the new .30 valve just to see if there is much difference, but I don't really feel like tearing the gun down and I rarely shoot it anyways.