I would make sure that the string is perfectly centered at the point of contact with your bolt. Most xbows have something on the string to 'center' the string like a different color to them.
If your scope is centered...I just don't get it. I don't own an xcaliber, but from what I've heard of them you should be dead on.
If your scope is centered...I just don't get it. I don't own an xcaliber, but from what I've heard of them you should be dead on.