For my 30BR rifle I am trying to decide which barrel tuner to buy that provides the most precision - at least 0.1 to 0.19 groups at 100 yards to be competitive. The club range I shoot BR matches at has shooting tables fairly close to each other, so out of courtesy I'm trying to stay way from tuners with muzzle breaks even though I know they provide an advantage of keeping crosshairs closer on target after discharge. After rounds have been fully developed for BR competition, which barrel tuner is most likely to provide at least 0.10 to 0.19 precision at 100 yards; which brand/type of barrel tuner should I get for this purpose. All comments are welcome.