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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrle Length...
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<blockquote data-quote="The Surgeon" data-source="post: 559673" data-attributes="member: 36761"><p>Mike, that was my belief with the test that Lilja performed. The 250 falls off at 46 , the 300 is still gaining velocity, and the 320 drops all around the 46 inch. The data or research he did was indeed inconclusive and I believe it was due to many uncontrollable variables, like barrel harmonics. In a field study like this there are to many variables with no absolute way of measuring them. The only absolute control he had was the charge, weight of the projectile, and the length of the barrel. </p><p></p><p>As far as barrel harmonics, if it indeed does affect velocity, is a constant variable . With factory or hand loads this variable remains and is it even measurable to the point that it can be distinguished from barrel length in regards to velocity. My guess would be, no. Barrel harmonics can not be removed from the equation, right? So all one could do is minimize it's effects by using a heavy test barrel. I feel it would be safe to say, that at 30 inches, harmonics will have minimal effect on velocity where as the length would be the bigger contributing factor in velocity. Either way, the shooter benifits in lenght/velocity, or at least up to 30 inches. At longer lengths I believe harmonics could be a significant factor but never the less it remains constant. By that I mean that the vibration should in theory increase in a theoretically predictable pattern. The only thing that changes is the length of the barrel.</p></blockquote><p></p>
[QUOTE="The Surgeon, post: 559673, member: 36761"] Mike, that was my belief with the test that Lilja performed. The 250 falls off at 46 , the 300 is still gaining velocity, and the 320 drops all around the 46 inch. The data or research he did was indeed inconclusive and I believe it was due to many uncontrollable variables, like barrel harmonics. In a field study like this there are to many variables with no absolute way of measuring them. The only absolute control he had was the charge, weight of the projectile, and the length of the barrel. As far as barrel harmonics, if it indeed does affect velocity, is a constant variable . With factory or hand loads this variable remains and is it even measurable to the point that it can be distinguished from barrel length in regards to velocity. My guess would be, no. Barrel harmonics can not be removed from the equation, right? So all one could do is minimize it's effects by using a heavy test barrel. I feel it would be safe to say, that at 30 inches, harmonics will have minimal effect on velocity where as the length would be the bigger contributing factor in velocity. Either way, the shooter benifits in lenght/velocity, or at least up to 30 inches. At longer lengths I believe harmonics could be a significant factor but never the less it remains constant. By that I mean that the vibration should in theory increase in a theoretically predictable pattern. The only thing that changes is the length of the barrel. [/QUOTE]
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