Oops! Something I wanted to mention, but forgot.

Notice the two groups on that 75 yard target - three shots nice and tight together above the bull, and two in the bull, also together? The front sight is a red fiber optic. The clouds were scudding across the sky during the entire session. For shots when the sun was out that front sight was glowing like mad, but when there were clouds across the sun the sight was a soft glow. Unfortunately, I wasn't keeping track of the conditions for each shot (wish I had). But I suspect that was a factor in the two different impact points.