The front sight needs to be moved opposite to the way you want the ball to go. The rear sight needs to be moved in the direction you want the ball to go. How much to move it is the next question. Sight movements are only a few thousandths of an inch at a time. Use a sharp knife blade to make a slight scratch on the base of your sight and continue the scratch onto your barrel. This will give you reference marks to determine how much you have moved your sights. Before you fuss about scratching your barrel and sight, I am talking about a very slight scratch that will be almost invisible to the casual observer. Now, as to how far to move your sight, first you need to know the distance from your front sight to your rear sight in inches. Next, you need to know the distance from your muzzle to your target in inches (25 yards is 900 inches, 50 yards is 1800 inches, etc.) Now, divide the distance from your front sight to your rear sight by the distance to your target. Use this number to multiply by the number of inches you want to move your POI. Finally, multiply this number by 1,000 to get the number of thousandths of an inch to move your sight. It may sound like a lot of trouble but it is all simple math (use a calculator) and will get you on target faster than just tapping on your sight and shooting to see if you have moved your sight the right amount.