I am testing a new brake, for a new builder, thus the note of the POI shift.

I see two fouling shots, then a pretty tight group. What am I missing?

He's covering up a couple more flyers with the dime.

5 shots isn't enough to foul in my experience. Sure some rifles might be fine after 5 shots.

Shots 8,9,10 are the same hole. Showing that with more fouling, it shot better.

Yes, but were they fliers or just a normal happenstance for said rifle? And secondly, would a 6.5 Creedmoor have theoretically done more better.

100 yds, or further?

100 yards.

^^^^

A 6.5 Creedmoor would've either done way better, exactly the same, or worse, with more, less or the exact same amount of recoil, while giving you the ability to tell your friends you own a 6.5 Creedmoor. I think its a no-brainer.

you are starting to make that AI sing to me

You're lucky that it only takes 7 or 8 rounds to get the accuracy back. My Creedmoor takes at least 15.

Fire formed, 80 gr is 3085 fps MV.

LabRadar, and DOPE on it yesterday confirmed. Just now went cold bore at 800, on the 1 MOA steel. It is an extremely fun cartridge to shoot!

Seen some take 20. Don't know why some are that way, but it happens.

Then I have seen another one that accuracy is about gone at 20 rounds after cleaning. Each rifle is a beast unto-its-self

^^That's right