Take your instructions, tools and reading glasses (if required). And shoot from a beanbag to take flinching, jerking, etc out of the equation. Then simply adjust the sight until your bullets impact where you're aiming. But then recheck your adjustments shooting the revolver the way you normally shoot it. The hardest thing to admit is that you could be causing the problem, and shooting from a rest will normally cancel that out. Buy the largest target the range sells if you need to so you can get it on paper.