That record has been surpassed last I checked. http://bulletin.accurateshooter.com/...at-1000-yards/
My point was that you cannot make a judgement on the quality of equipment based on what top competitors don't use. If that were the case then no one would ever market a minivan. Sure a minivan is a vehicle, but it is designed to do something entirely different than make laps around a racetrack.
Heck, before that Robert Frey used Lee Collet dies to set a 1000 yard record. https://fsreloading.com/catalogs/home.html