There are plenty of actual tests of longer vs shorter barrels.
The Truth About Guns did a test with .308. Started out with a Shilen match 26'' barrel and kept chopping it down until reaching 13''. They used several different types of ammo. Their results were that the shorter length actually did a bit better with consistent overall accuracy than longest length.
Google The Truth About Barrel Length, Muzzle Velocity and Accuracy
Last edited by ChattanoogaPhil; 04-27-2014 at 03:47 PM.
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