I'll go the other way and ring the Bonk bell.

While the extra weight and gas direction of the brake may have helped the shooter maintain steadier more consistent aim during 'rapid fire', I have difficulty with the notion there is (as indicated on the targets for comparison) 3-4 inches of shot dispersion caused by barrel harmonics to dampen out at a mere 50 feet.

Since most of these rifles shoot 2in groups at 50 yards, how is it possible to take out 3-4 inches of barrel harmonics at 50 feet?