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The Basics, Starting Out
Muzzle velocity vs barrel length
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<blockquote data-quote="djm670" data-source="post: 1483585" data-attributes="member: 36341"><p>There have been a couple of tests on a 6.5 creedmoor but I can only find the following one on a 300WM</p><p></p><p><a href="https://rifleshooter.com/2013/12/300-winchester-magnum-how-does-barrel-length-change-velocity-a-16-300-win-mag/" target="_blank">https://rifleshooter.com/2013/12/300-winchester-magnum-how-does-barrel-length-change-velocity-a-16-300-win-mag/</a> </p><p></p><p>And the maximum length barrel in this one is a 24.25" my guess is that longer barrel on a the larger diameter .300WM such as your 28" barrel is significant.</p><p></p><p>Each reduction in barrel length averaged 39.6 ft/sec in velocity loss. Significant jumps in velocity reduction occurred between 18.25 and 16.25 inches (56, 65 ft/sec) and between 23.25 and 22.25 inches (65 ft/sec). Standard deviation generally decreased as the barrel got shorter.</p><p></p><p><img src="https://i1.wp.com/rifleshooter.com/wp-content/uploads/2013/12/300-win-bbl-length-line.jpg?resize=404%2C295&ssl=1" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="djm670, post: 1483585, member: 36341"] There have been a couple of tests on a 6.5 creedmoor but I can only find the following one on a 300WM [URL]https://rifleshooter.com/2013/12/300-winchester-magnum-how-does-barrel-length-change-velocity-a-16-300-win-mag/[/URL] And the maximum length barrel in this one is a 24.25" my guess is that longer barrel on a the larger diameter .300WM such as your 28" barrel is significant. Each reduction in barrel length averaged 39.6 ft/sec in velocity loss. Significant jumps in velocity reduction occurred between 18.25 and 16.25 inches (56, 65 ft/sec) and between 23.25 and 22.25 inches (65 ft/sec). Standard deviation generally decreased as the barrel got shorter. [IMG]https://i1.wp.com/rifleshooter.com/wp-content/uploads/2013/12/300-win-bbl-length-line.jpg?resize=404%2C295&ssl=1[/IMG] [/QUOTE]
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Muzzle velocity vs barrel length
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