Best barrel length for precision AR

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I am not arguing the point that speed is a contributing factor to accuracy over long distances. You are correct in that point.

The point I am making is that there are numerous variables that also affect accuracy and that consistency is more important than speed. Yes, the folks that drive bullets fast in order to maintain a flatter trajectory and decreased bullet flight time use this to their advantage, but you can bet they attempt to eliminate any of the other variables that will negate any speed advantage. Inconsitent barrel harmonics, deviations in bullet velocity, quality of ammunition, OAL finely tuned to the particular rifle, bullet selection designed to mazimize the ballistic coefficient and other factors. We can use the statement" all else being equal", but the fact is , nothing is really equal.

You can drive a bullet at 3500 fps and yes, it will have decreased flight time when compared to a bullet fired at 3300 fps, but your particilar rifle may find its "sweet spot" at 3300 fps.
 
It's important to remember that handloaders seem to get the best accuracy when loading to a speed less than maximum for that combination. The highest fps generally has slightly degraded accuracy compared to one .5gn less powder, for example.

Speed is NOT the primary component for best accuracy.
 
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