Here is what he posted on Benchrest.com in regards to his equipment... he didn't answer all the questions, I think he is still on a high from shooting that group.
OK here's the equipment list when I shot my little group. I was using Brady Knight's 65 gr. boattails, Billy Stevens does all of my gun work, I had a March scope, a Krieger barrel, and the powder was some ancient Vietnam era 8208.... BAT action, Scoville stock.
I was loading with Billy Stevens and Eddie Harris (NC) and couldn't quite get on my load. It would put 3 in a little group but always spit one or 2 out. So I dropped my powder charge from 55 clicks to 52 and shot this group. It would make a better story if I had to shoot a sighter and hold off or something, but the truth is, I held in the center of the moth ball the whole time, and I was expecting it to spit one, but after the 4th one went in, I just shot the 5th one in the same spot. I turned around to Buddy Ross who was watching in a spotting scope and he said "Are you finished?" And I replied "I hope so", so I counted my brass and it was 7, with 2 sighters, that was it.
Johnnie
The caliber is of course a 6mm PPC. It dominates group shooting short range Benchrest.
As with all record small groups there is some element of luck combined with excellent components, (barrel, action, scope, gunsmith, etc.), plus a shooter who makes the ammo and tunes the load and shoots at his/her best. The equipment can not do it alone.