Our service rifle team uses Shilen ratchet barrels. I set a national record at Camp Perry with one of their 8T ratchet barrels in 2016, and I know there have been matches won with them since then. We worked with them over the last year or so on a 7.5T ratchet .224 barrel, and during prototype testing we found them to be very accurate and clean up really easy, same as the 8T ratchets. Also in longevity testing they are holding up extremely well and are maintaining match grade accuracy at 3000+ rounds.