Just wondering,,,,, what kind of scope is it??? Also,,, is the rifle new??
It could be a case of barrel droop,,, although I really don't ever remember reading any posts regarding a Hunter Extreme with barrel droop. Might sound like a stupid question but,,,, are you sure you have the scope mounted properly??
If it is a case of barrel droop you can shim the REAR scope mount cradle with a piece or 2 of 35 mm film negative. I've had todo that with my RWS rifles,, which are notorious for droop.
Have you tried any other pellets?? Maybe it just doesn't like the rockets......
Before you do anything though I would wait for some of the other GTA members to chime in. I'm sure a few of them own the Hunter Extreme and may be able to give you some first hand advice.....
Jeff