No, Kachok, it's smart luck, not dumb luck. They've got hardware, skills, knowledge and techinques to shoot average group sizes as small as possible. Good luck comes when they shoot a group the smallest shot; bad luck when they shoot the largest group ever shot.
Does Matt Kline also hold any aggregate records? If not, then he's luckier than most. Readers should check out the Pensylvania 1000 Yard Benchrest Club's web site and look at the sizes of groups shot:
http://www.pa1000yard.com/wo/choosewostandings.php
Matt Kline's best group averages in 2012 were from about 4 to near 8 inches. All with a .300 WSM cartridge. Which to me means his 2.815" 10-shot group was luck. Period.