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Rifles, Reloading, Optics, Equipment
Reloading
Accuracy Node???
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<blockquote data-quote="MagnumManiac" data-source="post: 1454477" data-attributes="member: 10755"><p>After extensive testing with a pressure trace and chrony, a node is simply all about EQUAL BARREL TIME. The VELOCITY at which this occurs really has nothing to do with it other than ALL velocities within THAT LOAD need to be close to each other to get the precision we are looking for.</p><p>A different powder will produce different barrel time even at the same velocity. Looking at pressure curves tells you a lot, if start pressure fluctuates wildly, often the ES is off the chart, BUT it has been noted that even with 100fps ES, a load can shoot tiny groups at CLOSE RANGE because the bullets exit at the same still point in the barrel vibration. Shoot this same load at 500 and you will have 2 distinct groups due to vertical dispersion.</p><p>There is no set rule that the barrel time of one powders velocity is going to be at the same point in barrel oscillation just because the velocity is the same. Different powders rise to max pressure differently and accelerate the bullet at different rates, therefore barrel time is different.</p><p></p><p>Cheers.</p><p><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 1454477, member: 10755"] After extensive testing with a pressure trace and chrony, a node is simply all about EQUAL BARREL TIME. The VELOCITY at which this occurs really has nothing to do with it other than ALL velocities within THAT LOAD need to be close to each other to get the precision we are looking for. A different powder will produce different barrel time even at the same velocity. Looking at pressure curves tells you a lot, if start pressure fluctuates wildly, often the ES is off the chart, BUT it has been noted that even with 100fps ES, a load can shoot tiny groups at CLOSE RANGE because the bullets exit at the same still point in the barrel vibration. Shoot this same load at 500 and you will have 2 distinct groups due to vertical dispersion. There is no set rule that the barrel time of one powders velocity is going to be at the same point in barrel oscillation just because the velocity is the same. Different powders rise to max pressure differently and accelerate the bullet at different rates, therefore barrel time is different. Cheers. :) [/QUOTE]
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Reloading
Accuracy Node???
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