Ah. When you said he was shooting 9's, 10's and X's at 200 yds with iron sights with a .22, I thought you meant with a .22 long rifle, and I thought that was pretty phenomenal. Not only have I never seen that done, I've never even heard of it being done. I was really, really,
really impressed, because, while the round will certainly travel that far, I don't think it's accurate enough at that range.
Now that I know you're talking about a .223, which is a heavier, higher velocity round, and pretty accurate, too, it makes more sense.
When I was a young Marine we used to routinely shoot at 300, 400, and 500 meters with iron sights (7.62 mm/.308), and some of us were pretty good (others, no so much), and thought we were hot. Then we saw an old guy (old to us; he was probably in his early thirties) knock shot after shot through the ten ring at 500 meters.
Now, granted, the ten ring is pretty large at that distance (bigger target), but it's not
that big. Most people couldn't do that with a scope: this guy was doing it with iron sights. We found out that he shot at Wimbledon for the Marine rifle team. Some of us thought we were shooters, until we saw a
real shooter in action.
I spent a lot of time on the range after that trying to get that good. Yes, I got to be fairly good after thousands of rounds, but
that good? Nah... not going to happen.
You can try a patch if you think it will help. What we did with the guys that had trouble using both eyes at first, was to have them sight, cover their shooting eye so they were only looking out of the other eye (not the sighting eye), and
then uncover the sighting eye. I don't know why that worked, but it seemed to help a lot of guys.
I learned to shoot way back when with iron sights, and never had any trouble keeping both eyes open. Now I can't even
see the damned sights. Sigh. Old age is such fun... not.