screws in the breech and loose barrel in the barrel band. If it has never shot good then check the barrel crown for burrs and the lead in for burrs at the t-port area. Good pellets do make a difference although my bet is the cheap stuff will do better than what you are getting. Put the gun on a rest and make sure not to yank on the trigger also.
I used to have a life. But now I have the forum. I am a sick man?