Can anybody help me with this.I tryed to sight in my xbow scope and at 20 yards my arrows were hitting the center of the target but I cold not seem to get the verticle set up. No matter how much I moved the adjustment it didnot apear to change the point of impact. Any ideas? Thanks

What scope and bow mister?

In order of probability:
Rings too tight
Rings not in alignment [both facing same way?]
Scope is trashed

Try tapping on the adjustment w/ handle of a screw driver, if it does move you could be off the target, I'd shoot at 10 yds til you see whats up. Like Dnk said would help.

sounds silly....but are you sure the scope is oriented correctly. by that i mean is the vertical adjustment on top and the horizontal on the side. could be you're adjusting the horizontal thinking it is the vertical.

I've had this happen w/ a shotgun scope (except for windage, not elevation). I took it to a gunsmith and he said the the windage adjustment knob was not properly connected to the crosshairs and when I turned the knob, the crosshair would not move. Have it mounted by a professional and if the problem keeps up return it, as that would mean you were sold a defective scope.

Sorry about not replying sooner. Work and the holidays took over. The scope and bow are a Quad 300 set up. I haven't had a chance to mess with it yet, but I'll post again once I have a chance to shoot again.

Well there's your probem