Matt Dienes shot this group in practice while in Pella Iowa for the IBS Nationals on September 1, 2005. It was fired at the 1K range which has no pits. So the score of 100-9x was shot with no sighters on paper either.
The group measured roughly 2.625" but never had an official measurment to my knowledge. The 9 in the x ring measured 1.750 or smaller, I don't remember exactly. It was small anyhow. Way under 2"