Unfortunately, we can't totally prevent barrel whip. All we can do is cope with its effect, using three methods: freedom, repression and what's often called "tuning."
The barrel whips up and down like a jiggled fishing rod, and those are just the vibrations we can see, since it also expands slightly as the bullet passes through the bore, like a snake swallowing a mouse, and even twists due to the torque of the rifling.
Ported tubes allow gases to leave the muzzle evenly, reducing barrel whip
. The chokes are available in different styles to accommodate different waterfowl hunting situations, from decoying to pass shooting.
Nodes of vibration and barrel whip
are all very interesting subjects.
Doing so results in the total elimination of barrel whip
and in significantly smaller barrel oscillations when the gun is fired.
You might not think that a little pipsqueak .22 LR would generate all that much barrel whip
to profit from the thicker walls of the DPMS receiver but since I switched from standard upper receivers to the thicker Lo-Pro I have noticed .22 LR group shrinkage on the machine rest.
Although I have not set up any studies to quantify this, my gut feeling is that guns that exhibit more barrel whip
probably profit more by proper fitting of the barrel extension than lighter recoiling guns.
The principle here involves dampening of barrel vibration tones (barrel whip
), thereby improving accuracy.
As the barrel whips
, those high spots constitute a pivot point making shot-to-shot harmonics less uniform.