Friend of mine won the National Championship a couple of years ago using a Mauser single shot action in .300 Win Mag. I just cut 2 inches off the back of the barrel and rechambered to .300WSM. He shot it Saturday at 600 yards and reports half X ring elevation (1 minute) from the prone position. So, Id say that while I wouldn't use one as a match action, some people are having pretty darn good luck with them.