It's not actually knocking the scope out of wack, just shifting thePoint Of Impactfrom the Point Of Aim. The bullet is affected by gravity in a vertical direction. When you tilt the gun, your line of departure for the bullet is changedbased on theamount and direction of tilt.When you tilt, the barrel will be pointingto a different vertical plane from your scope dueto the angle difference between the line of sight and the line of departure (line of bore). Gravity will act on the bullet and it will end up shooting to a differentPOI than the POA. Distance and degree of tilt will determine how much difference it will be. It's been a while but I seem to remember that if you tilt right the POI will shift the the right.