RR,

That is scary good.

I believe that 6" at 600 yards is possible. However to guarantee it! How the heck do they do that?

Seems like it could backfire with a proper lawyer.

Also another question. I've known about the fact that even guns that shoot sub moa at 100 or even 200 can really open up beyond those distances. What would you say is typically the main factor driving that phenomenon? Not enough powder? Mag Primer needed? Different bullet?

Tom