I shoot the 308 in competetion and it is indeed one of the world's premier target rounds and your rifle "out of the box" will perform very well indeed just as it is. I could see no advantage to a muzzle brake on your rifle and in fact, a brake can disturb the gas flow to such a degree that it will disturb the flight of the bullet leaving the muzzle. If it is for recoil reduction, then the offset on that is the ungodly noise created?? I personally would leave it alone and work up some good loads for it and have the trigger adjusted to about a crisp 2.5 pounds, good optics, and you are well set for some excellent shooting IMHO