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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Optimal Barrel Length for .223 Rem.
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<blockquote data-quote="benchracer" data-source="post: 1174205" data-attributes="member: 22069"><p>Here is a link to the results of actual testing of the effects of twist rate on muzzle velocity:</p><p> </p><p><a href="http://bulletin.accurateshooter.com/2015/02/does-barrel-twist-rate-affect-muzzle-velocity-litz-test/" target="_blank">http://bulletin.accurateshooter.com/2015/02/does-barrel-twist-rate-affect-muzzle-velocity-litz-test/</a></p><p> </p><p>Spoiler alert: The 1.5% figure is a bunch of bs someone has pulled from their posterior.</p><p> </p><p>Bottom line: Your 9 twist barrel isn't costing you muzzle velocity.</p><p> </p><p>I don't believe the suppressor bore will do anything to help you in terms of velocity because it will still cause a pressure drop relative to the bore of the longer barrel. I have no way to back that up with hard data, though. That is just my best guess.</p><p> </p><p>I have a 5.56 chambered bolt action with a 24" barrel and a 5.56 chambered AR with a 16" barrel. The difference in muzzle velocity between the two, using the same load, is around 300 fps. Based on that, I would expect you to lose around 150fps by going to the 20" barrel.</p><p> </p><p>BTW, I am a big CZ fan. The 527 Varmint is a great rifle. Good choice!</p></blockquote><p></p>
[QUOTE="benchracer, post: 1174205, member: 22069"] Here is a link to the results of actual testing of the effects of twist rate on muzzle velocity: [URL]http://bulletin.accurateshooter.com/2015/02/does-barrel-twist-rate-affect-muzzle-velocity-litz-test/[/URL] Spoiler alert: The 1.5% figure is a bunch of bs someone has pulled from their posterior. Bottom line: Your 9 twist barrel isn't costing you muzzle velocity. I don't believe the suppressor bore will do anything to help you in terms of velocity because it will still cause a pressure drop relative to the bore of the longer barrel. I have no way to back that up with hard data, though. That is just my best guess. I have a 5.56 chambered bolt action with a 24" barrel and a 5.56 chambered AR with a 16" barrel. The difference in muzzle velocity between the two, using the same load, is around 300 fps. Based on that, I would expect you to lose around 150fps by going to the 20" barrel. BTW, I am a big CZ fan. The 527 Varmint is a great rifle. Good choice! [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Optimal Barrel Length for .223 Rem.
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