Here's the speeds with some pellets with the trigger assy moved back on my .22 and my .25 All at 3300psi regulated from the bottle. Haven't touched the hammer spring yet.
.22 18.13gr 971, 959, 962 25.39gr 817, 817, 808 [33.956gr 686, 679, 690 (didn't fit mag)].
.25 25.39gr 828, 819, 838 33.95gr 682, 679, 703 41gr BBT bullet 468fps, next bullet stuck in barrel, too tight. Or maybe too heavy for bolt to function properly. I'll size one down and see if it does better. I just checked fpe for the highest speed for each weight. 18.13 and 25.39 in .22 both did 38fpe, 33.956 did 36fpe. Must need heavier hammer spring and or hammer. The bolt must be getting blown back before Elvis leaves the building as Bob Sterne would say. I'll leave that part for Travis to play with. Regards, Tom