It's real, guys. The site owner goes by Matthias 72 on Excal forum, this is off of his Italian site which has all kinds of good info at the following link:http://www.cacciaebalestra.altervista.org/ It's also where Sproul got his 2" group info, however he neglected to say the average group size was 5.5", so there had to be some 8" stuff involved to get a 5.5" average. They used inserts in lieu of nocks to increase foc, and I'm fairly sure from the speed listed on the rest of the data, these were shot out of an Emax.
He also hassome impressive 100 yd groups, and somewhere or another I've seen the custom buitl scope mount that tilts the scope for rough adjustments to shoot these long range target matches. It's mostly Excal stuff, but the winner of their last long range match was shooting a Horton.

I see the above link don't work, try this one: http://www.cacciaebalestra.altervista.org/INGLESE/Main0.html