bigben: It's a Mrod. Beg, borrow, buy or download a chrono. Set the velocity to 875-925fps with the pellet being tested. Then the gun will tell you what pellets to use. Every rifle will prefer a different pellet, at a certain speed. Every one of us on the GTA could give the preferred pellets of our rifles,,,,,,and your rifle could hate every one of them. Who knows, it could like the cheap GAMO magnums. And if you haven't already, download Chairgun, it's very useful.
Sounds like I need a chrony, I suspect mine is set low right now, i easily start on a 3kpsi fill, shoot 2 mags and i am at like 2600ish psi.... at 900ish fps what kind of shot/fill shouod i get, any substitution for a true chrony?!?! someone said download a chrony?!?!?! im assuming its an app, how reliable is this kinda thing?!?!!?