"I've come to the conclusion that a3 shot "group" only has weight if it is repeatable with consistency."

You are 100% correct! One 3-shot group proves nothing - if your rifle shoots ONE good 3-shot group, it must be able to do it again and again with pretty much the same results each time, or it means nothing. What is important is the AVERAGE SIZE of a numbewr of 3-shot groups fired under the same conditions with the same load as the best one.

However, most of us tend to save the BEST group, me included!