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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Heaviest projectile for 22-250
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<blockquote data-quote="benchracer" data-source="post: 893228" data-attributes="member: 22069"><p>The controversy with the 53g VMAX involves whether or not it will work in a 14 twist. Reported results in a 14 twist are mixed. Hornady themselves state that a 12 twist or faster is needed for the 53g VMAX. Note that a minimum velocity is not specified. Velocity has very little effect upon stability. Spend a bit of time playing with a twist calculator and that becomes very clear. Here are two good online calculators:</p><p> </p><p> <a href="http://www.jbmballistics.com/cgi-bin/jbmstab-5.1.cgi" target="_blank">JBM - Calculations - Stability</a></p><p> </p><p> <a href="http://www.bergerbullets.com/litz/TwistRuleAltWP.php" target="_blank">http://www.bergerbullets.com/litz/TwistRuleAltWP.php</a></p><p> </p><p> Both calculators are based on the Miller stability formula, which more closely approximates modern bullet designs than does the Greenhill formula. Note that the JBM calculator accounts for the length of the plastic tip and the Berger calculator does not (which makes sense given that Berger does not make plastic tipped bullets).</p><p> </p><p> According to the JBM calculator, the 65g SGK will stabilize in a 12 twist. Sierra says a 7 to 10 twist is needed for this bullet. The 63g Sierra will stabilize in a 12 twist according to both Sierra and the JBM calculator. Berger says their 64g bullet requires a 12 twist to stabilize.</p><p> </p><p> So, in answer to the OP's question, a 12 twist should reach its limit somewhere in the 63 to 65 grain weight range. As has been mentioned by others, bullet length can play just as important a role in whether or not a bullet will stabilize. Plastic tipped bullets can prove to be a bit different in this regard as well.</p></blockquote><p></p>
[QUOTE="benchracer, post: 893228, member: 22069"] The controversy with the 53g VMAX involves whether or not it will work in a 14 twist. Reported results in a 14 twist are mixed. Hornady themselves state that a 12 twist or faster is needed for the 53g VMAX. Note that a minimum velocity is not specified. Velocity has very little effect upon stability. Spend a bit of time playing with a twist calculator and that becomes very clear. Here are two good online calculators: [url=http://www.jbmballistics.com/cgi-bin/jbmstab-5.1.cgi]JBM - Calculations - Stability[/url] [URL]http://www.bergerbullets.com/litz/TwistRuleAltWP.php[/URL] Both calculators are based on the Miller stability formula, which more closely approximates modern bullet designs than does the Greenhill formula. Note that the JBM calculator accounts for the length of the plastic tip and the Berger calculator does not (which makes sense given that Berger does not make plastic tipped bullets). According to the JBM calculator, the 65g SGK will stabilize in a 12 twist. Sierra says a 7 to 10 twist is needed for this bullet. The 63g Sierra will stabilize in a 12 twist according to both Sierra and the JBM calculator. Berger says their 64g bullet requires a 12 twist to stabilize. So, in answer to the OP's question, a 12 twist should reach its limit somewhere in the 63 to 65 grain weight range. As has been mentioned by others, bullet length can play just as important a role in whether or not a bullet will stabilize. Plastic tipped bullets can prove to be a bit different in this regard as well. [/QUOTE]
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Heaviest projectile for 22-250
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