Scope Problem. Hi - I recently bought a RWS 350 Mag .22 with a UTG 4-16 illuminated scope. It was stunningly accurate when it arrived, but is now giving me fits. I keep re-zeroing at full magnification and 45 yards. I typically get .5" to 1" groups. Then, I zoom down to low power, re-focus the parallax, shoot at (and usually miss a starling), and zoom back in to 45 yards at full magnification. Sometimes it is close to zero, but others it is as much as 6 inches off in any direction. Rings and all mounting screws are tight. I need a scope I can count on - is this a common problem with the UTG? (It is my first UTG) - I don't care nearly as much about the money spent on the scope as all the time and effort I am wasting on the process - and frustration over all the missed pest birds! What scope would you recommend that I switch to? Randy PS - I am a very experienced shooter, I can get 1" groups at 500 yards with my high-end hunting rifles. I am shooting the pellet rifle off of sand bags and completely floating it when aiming at targets. When I am missing birds, I am usually on a trigger stick tripod and my shoulder....