I know about "the wheel" - a diagram that helps shooters figure out what they're doing wrong based on their shot placement. Here's a really good explanation of the wheel that's a little more in depth.
Back to square one, it had to be something I was doing, so he watched me from several angles to make sure I wasn't doing anything wrong. After three or four rounds he asked, "Which eye are you shooting with?"
Suprised, I answered, "Right. Why?"
He asked if I could shoot with my left eye, so I did. Guess what? Dead freaking on. Every round.
I am strongly right eye dominant, so I was surprised that I was shooting better with my left eye. We picked out a different area on the target and I shot using my left eye to sight in, dead on. I lowered my gun to the low ready to check the target, brought it back up and threw the next round. Double Tap asked which eye I had used. I had to think about it for a second and realized that when I brought my gun back up on target I'd automatically switched to my "strong" eye.
I'd been complaining for a while about not being able to see my front sight, but I blamed it on the color I'd painted my sight. But I can see the sight with my left eye and can drill the hell out of one hole left eyed, so we ruled out the color being the problem. Before I spring for a new front sight, I want to try out several colors so I know which color to buy. Currently my sight is a bright red. That my right eye can't see! I'll try a neon green next. My intention is to buy a Hi-Viz or something similar, but for that kind of money, I want to make sure I can see the sight every time.
We ruled out a mechanical issue with my stance and grip.
We ruled out loose sights.
We ruled out the color.
That leaves me with crappy eyes. Well, one crappy eye.
Guess who is going to be heading back to the eye doctor in short order? And if she tells me one more time that it's because I'm "forty now", Ima punch her in the nose.