I have the 3000psi pcp conversion tube from Eric, I do not have a chrono at my disposal so I spend alot more time with poa and poi with a given number of shots to determine "full power" to drop off, as well as using chairgun. This has enabled me to tune for accuracy the long way around but has proved to be a good method with the tools I had. There is a correction to my type of pellet.....premier hollow points 14.3gr in the QB, the jsb's are what I use in the AT44. Bob, have you converted a QB with one of the kits Eric sells? I kinda keep an eye out for your tunings as I've learned alot.