Unscrew both screws untill they are flush with the ends of the regs.
Screw the HPR (the bottem one) in 4-5 full turns.
Then screw the LPR in (the 1 by the barrel)(slowly) untill the guage reads 60-80 psi
That should put you in the area of 280-300 fps
Adjust your hpr untill you get the right fps.. screw in to turn up, screw out to lower...