That's nothing, I shot this one @ 500 yards, from my weak side while tap dancing across the top of a jackhammer while it was running. Not impressed? I forgot to mention I was blindfolded at the time.
Yep.
On a factual note, this is a 5-shot group and the first two shots went into the same hole just right of the bullseye. Therefore by your logic, that 2 shot group makes my rifle a .0005 MOA shooter because that's the smallest discrepancy I can measure for those two shots.
Post up 5 targets, 5 shot groups apiece, then tell me about your .18 MOA rifle.