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Rifles, Reloading, Optics, Equipment
Reloading
Getting the Best Precision and Accuracy from Berger VLD bullets in Your Rifle
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<blockquote data-quote="Rickroyem" data-source="post: 1011320" data-attributes="member: 61142"><p>Yes,</p><p> </p><p>Read Brian Litz's books (LRH store), and a PDF paper on shock wave theory by Christopher long (<a href="http://www.the-long-family.com" target="_blank">www.the-long-family.com</a>) & watch Reloading for Long Range Hunting also available in the LRH store, I think.</p><p> </p><p>We all intuitively know that longer-stiffer-heavier barrels & lower BCs are better for precision. Long's study demonstrates that a barrel flexes as the powder explodes creating a curve in the barrel that changes the point of aim for milliseconds. Long provides a xls sheet that predicts the "nodes" or the milliseconds from powder ignition until the bullet exits the barrel at the instant the barrel is again straight.</p><p> </p><p>The jamb-jump discussion with VLDs is about getting the centerline of the VLD bullet on the barrel centerline and adjusting the time that the bullet is in the barrel. </p><p> </p><p>I just started using Long's predictive spreadsheet for "bullet time in the barrel" with Quick Load to optimize the powder load based on matching bullet time in the barrel with Longs prediction and optimizing barrel pressure.</p><p>The two loads I have tried have been amazingly precise for a first trial-- .5 MOA at 200 yds.. There were three 30 cal. holes that I could cover with a dime & 2 further out. For jamb-jump I just randomly chose .010".</p></blockquote><p></p>
[QUOTE="Rickroyem, post: 1011320, member: 61142"] Yes, Read Brian Litz's books (LRH store), and a PDF paper on shock wave theory by Christopher long ([URL="http://www.the-long-family.com"]www.the-long-family.com[/URL]) & watch Reloading for Long Range Hunting also available in the LRH store, I think. We all intuitively know that longer-stiffer-heavier barrels & lower BCs are better for precision. Long's study demonstrates that a barrel flexes as the powder explodes creating a curve in the barrel that changes the point of aim for milliseconds. Long provides a xls sheet that predicts the "nodes" or the milliseconds from powder ignition until the bullet exits the barrel at the instant the barrel is again straight. The jamb-jump discussion with VLDs is about getting the centerline of the VLD bullet on the barrel centerline and adjusting the time that the bullet is in the barrel. I just started using Long's predictive spreadsheet for "bullet time in the barrel" with Quick Load to optimize the powder load based on matching bullet time in the barrel with Longs prediction and optimizing barrel pressure. The two loads I have tried have been amazingly precise for a first trial-- .5 MOA at 200 yds.. There were three 30 cal. holes that I could cover with a dime & 2 further out. For jamb-jump I just randomly chose .010". [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Getting the Best Precision and Accuracy from Berger VLD bullets in Your Rifle
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