You have a number or a fraction on the inside of the windage cap, or you should, it will say something like 1/4 or 1/2? That will tell you how many fractions your scope moves with each click, at 100 yards. Anyway, there is also a left and right direction on the scope, you want your scope to go in the direction of your bullet miss, this will pull the barrel over to the center, again, it is supposed to. If you have run out of clicks, you will need to shim your scope. So, on the 1/4 inch at 100 yards, you will want to move the dial, 8 to 12 clicks to the right. Shoot it again, if it went the wrong way, you know what to do. If it didn't move at all, try this.... If it is a bolt action rifle, pull the bolt out, mount the rifle in a cardboard box with v grooves cut in it so it will cradle and not move, or a vise, sight down the barrel at a target at 100 yards, then peek down the scope, it should be right on the target, if not move the cross hairs till it aligns, check the barrel again, make sure it didn't move, then peek through the scope again, if it is the same, it will be on paper at 100 yards, if it is not a bolt action, the only other rifle you can d it with is an AR type rifle. This is a military trick, not something I dreamed up, it works. Check it out.