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Rifles, Reloading, Optics, Equipment
Reloading
OBT method, barrel length vs velocity
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<blockquote data-quote="Mikecr" data-source="post: 1998558" data-attributes="member: 1521"><p>[ATTACH=full]219038[/ATTACH]</p><p>Ok, there is a vibration born from max pressure peak that travels back and forth at the speed of sound in barrel steel. Theoretically, a major element of this opens the muzzle, while there, and this would be detrimental to consistent bullet release. Considering the research by Harold Vaughn, as published in Rifle Accuracy Facts, It is reasonable to avoid muzzle release at one of the peaks pictured. That is, better to be somewhere between them.</p><p></p><p>As to predicting troughs and peaks(supposed nodes) <u>in between</u> the major peaks,, that I gotta call boarsheet on.</p><p>There are all kinds of vibrations(including other modes, and sources) reflecting around, adding and subtracting with interference. All this is abstract and unknown.</p><p>With this, I'm telling you, that you are going to have to powder develop for best results -regardless of fun with math over barrel lengths.</p><p>POWDER ADJUSTMENT IS TUNING.</p><p></p><p>If you install a tuner on your gun, you can shape grouping a bit, but you will still have to powder develop for best results. So this is just what we do -without fretting over OBT.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1998558, member: 1521"] [ATTACH type="full" alt="OBTnodes.jpg"]219038[/ATTACH] Ok, there is a vibration born from max pressure peak that travels back and forth at the speed of sound in barrel steel. Theoretically, a major element of this opens the muzzle, while there, and this would be detrimental to consistent bullet release. Considering the research by Harold Vaughn, as published in Rifle Accuracy Facts, It is reasonable to avoid muzzle release at one of the peaks pictured. That is, better to be somewhere between them. As to predicting troughs and peaks(supposed nodes) [U]in between[/U] the major peaks,, that I gotta call boarsheet on. There are all kinds of vibrations(including other modes, and sources) reflecting around, adding and subtracting with interference. All this is abstract and unknown. With this, I'm telling you, that you are going to have to powder develop for best results -regardless of fun with math over barrel lengths. POWDER ADJUSTMENT IS TUNING. If you install a tuner on your gun, you can shape grouping a bit, but you will still have to powder develop for best results. So this is just what we do -without fretting over OBT. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
OBT method, barrel length vs velocity
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