As soon as one question is answered, it gives rise to others. There are no answers about the optimum barrel length without first defining the anticipated shooting environment and personal preferences.
Oneounceload makes a great point, some environments involve dynamic targets while other targets are nearly static. Also, there's the way the barrel is sighted: for dynamic targets, one points the gun, actually the experienced shooter is looking at the target, not the bead. For static targets the barrel is often aimed.
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Originally Posted by mete
More myths , even from the makers !!
Shorter swings faster ? NO , as you are swinging your whole upper body not just the gun .
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IMHO, this is an over simplification and may be misleading. Let's look a the physics of the situation: Newton tells us a resting body will accelerate as a force is applied. The rate of acceleration can be determined by the inertia of the object and the magnitude of the force. The body's inertia is determined by the configuration of it's masses. If the body happens to be a shotgun (or other slender item), changes in length greatly effect its inertia. If you are used to a particular shotgun, shortening its barrel will reduce it's inertia. With the reduced inertia, it will take less force to accelerate the gun at the previous rate. Or, if you apply the same force as you did previously, the gun with the reduced inertia will have more acceleration. It doesn't matter if you swing the gun with just one hand or your whole body the same laws of physics apply. However, as you put more of your body into the swing, the effect of the change in the gun's inertia will seem to lessen.