XCR Accuracy?

[carbonrod]

Three shot groups are statistically meaningless - unless they are stacked one on top of the other with the aiming points lined up. In all likelihood, the composite group size will be somewhat greater than any single 3 shot cluster.

There is a really good article about this here:
http://www.ar15.com/forums/topic.html?b=3&f=118&t=279218

3 shots *might* have some sort of meaning if it is applied to a known repeatable bolt gun, but to a mag fed, piston banger, probably not.

I am not meaning to direct this at anyone here. I just find 10 shots to be the minimum that is useful when looking at the performance of a rifle. And even then, both precision and accuracy need to be analyzed.