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Old September 25, 2012, 05:45 PM   #25
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Join Date: December 20, 2008
Location: Somewhere on the Southern shore of Lake Travis, TX
Posts: 2,460
Barrel ports or muzzle brakes redirect the power gasses in a direction that does not add to or even cancels some of the recoil.
These powder gasses weigh just as much as the original powder charge that generated them.

With a target load, you have about 18-20 grains of powder and 580 grains of shot. The mass of the shot is responsible for almost all of the recoil so taking that 18-20 grains of powder out of the equation will barely be felt.

With rifle loads, you might have 45-50 grains of powder accelerating a 150 grain bullet. Removing the powder's contribution to recoil will be noticable.

As you get to the 4000+ fps varmint rifles, the powder often outweighs the bullet. A 100% effficient muzzle brake could theoretically make such a gun kick forward.

A muzzle brake might be effective in a shotgun for black powder loads, where the powder charge weighs 80-90 grains.
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