I've addressed all this a couple of times already. in the data table, the most dramatic change in group size occurred between two shots and three shots. I hardly think this can be attributed to the barrel heating up, getting dirty, the shooter getting tired. The group size doubled from 2 to 10 shots. I think that's simply statistics in action. The data in that table could very well represent throwing darts - the statistical spread would be about the same.

You could clean your gun after every shot, you could water cool the barrel, whatever, and that wouldn't keep the group from enlarging as you shoot more shots at the same target. Look at my last target. Do you really think in 18 shots, it was barrel fouling, barrel heating, etc. etc. that caused the larger group when more shots were fired at the same target? Or could it be the inconsistency of the shooter's ability to sight and hold the gun in the exact same spot every time?

Here's something I did after I shot that last 9 on 1 target. I put up another target and shot three shots and that target looked pretty much like the other three shot targets I shot previously.

I've addressed this before as well. This has nothing to do with population and sample size. What is the population? What is the sample size? This is about what this person could do with a 1 MOA rifle. If we are throwing darts, we'd find a similar result, it has nothing to do with the population or samples. There are no outliers, all shots are included in the determination of group size.

The group spreads according to statistical probability and of course with gross shooter error. But I had no gross shooter error in my four targets.

Let's think about this: If I shoot two shots, I now have a group size. There is no place I can shoot the next shot that will make the group size smaller. So I have zero probability of getting a smaller group with an additional shot. But I do have a probability of the third shot making the group larger. So here we have absolutely no chance of subsequent shots reducing the size of the group, but there is a chance of subsequent shots making the group larger.

Let's look at it another way. When I shoot at a specific target, at a specific range, and shoot two shoots, does that represent the worst I will do? If it does, then all my subsequent shots will fall within that initial group and the group size does not change. But, if those two first shots represent say may best ability then what's gonna happen the more I shoot? My group size is gonna grow larger.

Probability shows that there is a more likely probability to get two hits in two trys, than to get three hits in three tries and so on.