So here’s a tuner test I did a few weeks ago. It was the tmb tuner, not the ec. I was crunching n570 and was at my max coal for feeding in a 300 prc with 245 Berger’s so I wanted to keep coal and was right where I felt good with pressure. The last bottom left is me adjusting and then setting zero stop and final is bullseye. This is at 200 yards. I tested data at 600 and 1000 last weekend and was shooting very well for conditions 4-15 wind. I only have a pic of my buddies grandson shooting a 22 creed at 1000 and you have to zoom to see target in fresh dirt. This process works for me and saves me some time and components and only reason I’m posting is maybe it will do the same for someone else.

I understand where you're coming from & sometimes it can work out but, cross my heart & hope to die, you're more than likely seeing what you want to see. Please understand, I'm not trying to belittle you when I say that. Seeing what WE want to see is in essence a very large part of what robust testing is designed to avoid. As an example, I've shot many dozens of 10 shot groups that started out with the 1st 3 or 4 shots with a bug hole group. Keep slinging led at the target & the story changed dramatically. I've had that happen so many times I have wondered about it.

In your post you made this statement:

" Groups start at top left and go clockwise. 2 shot groups unless I felt there may be something or I felt I might have pulled a shot."

This is exactly the kind of self induced bias that WE all can easily introduce into our testing that more robust testing methods cancel out.

The number of samples (shots) we use in our testing has a direct impact on "confidence" & in statistical terminology is presented & calculated as "confidence interval". A confidence interval can be directly applied to a specific number of samples. I am of the opinion that statistical confidence is poorly understood or ignored completely by most shooters however, it is one of the most important aspects of statistical analysis.

Statistical confidence can be compared to betting on an outcome.

For example, lets say you or I shoot a 0.3 MOA 3 shot group. If you were asked how much you are willing to bet that you could shoot another 0.3 MOA 3 shot group or smaller, how much would you be willing to bet?

If I were forced to make that bet, my personal choice would be $5. Would you bet $10,000?

Almost certainly not. This is basically the essence of confidence intervals.

Without knowing any of the math or fancy formulas, you intuitively know the chances (probability) of you winning that bet.

If you shot 10 shots into 0.5 MOA & were asked to bet on shooting the next 10 shots into 1.5 MOA or less, what would you bet? I reckon you'd consider $10,000 especially if you had a very high quality, proven rifle/ammo combo.