Id always shot irons wrong. Got a good lesson from a member on here concerning shooting my sharps and really concentrating on that front sight. The rear, whether peep or leaf is just to line up your sight to be able to see the front and it centers it on its own. If you get lazy and blurr out the front sight to see the target better, your accuracy will suffer. If you hone in on that front sight your groups will tighten considerably. I bought one of those spinning metal 22 targets and started shooting at 60 yds with irons. It amazed me that that little orange target was so easy to hit when you beared down and used that front sight.
