I am with you here. I spent a lot of time gathering and plotting XBar and R charts on all kinds of things.
Dahermit is correct that three shot groups do not mean much for BR shooters.
For that matter, neither do 5 shot groups.
What is really important is what kind of use YOU have for the rifle.
If you are using it for hunting, then confidence in where the first shot goes is the important thing for you. All the rest is just fluff.
If you are anticipating BR shooting, then you will enter a whole 'nother place.
In any event, enjoy your rifle.
Dahermit: No insult intended, I hope none is taken.