I don't have a 6 PRC like Hunt's does but I've a long history with the 6/06 which is darn close but not quite. I've been around 9 barrels for it or, by and large we went 1700-2500 rounds before they gave up the ghost. We had them pretty well dialed so load work on a new barrel was generally less than 10 rounds. The rest of the rounds were pretty much in the killing fields with a stop here and there to shoot one round to make sure they were still 1" high @100.
I suspect the 6 PRC won't quite get this kind of round count but if one would go to top end then drop down 100 fps give or take you'd get darn close.
Just a thunk
(I'm giving strong thought to having one done off my 70/7WSM action once I run out of brass for the 7)