I really don't care about the "Accuracy Challange". Sending in targets of "supposed" groups means absoluley nothing. I don't even care if the targets are "certified".
Reading many posts about accuracy and groups, people on the internet out shoot David Tubb and many other top shooters. After all, it's on the internet so it must be true!
Also, just because a rifle shoots MOA or sub-MOA at 100-200 yards doesn't mean it will maintain that MOA at all distances.
I would do a head to head shoot though. Equal conditions, just the shooter and the rifle. And not at 100 yds., how about 600-800 yds., heck, if your going to shoot for accurracy shoot at a distance. I can throw a brick and hit the target at 100 yds (not really), but you know what I mean.