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Twist rate
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<blockquote data-quote="sable tireur" data-source="post: 3085941" data-attributes="member: 27307"><p>The traditional factory twist rate for the .257 rifle cartridges has been 1:10" for a long time. This is due to the prevalence of the shorter cup and core (lead) bullets. </p><p></p><p>The current trend though has moved towards the longer, sleeker VLD bullets and the solids which are significantly longer than the lead core copper jacketed bullets. Longer bullets change the required twist rate to the 1:9" or even faster, some running as fast as 1:8.25" for copper solids in the 100 grain range. The discontinued 100 gr. Berger Classic Hunter needs a 1:9" for proper stability.</p><p></p><p>In many cases simply stating a weight isn't as helpful as the bullet construction and the length of the bullet chosen. It's sometimes easier to run some of your data through the Berger Stability Calculator to do a 'what if' for the suggested twist rate before making a commitment to any bullet in particular.</p><p></p><p><a href="https://bergerbullets.com/twist-rate-calculator/" target="_blank">https://bergerbullets.com/twist-rate-calculator/</a></p><p></p><p>JBM Bullet Length List (not updated)</p><p></p><p><a href="https://jbmballistics.com/ballistics/lengths/lengths.shtml" target="_blank">https://jbmballistics.com/ballistics/lengths/lengths.shtml</a></p><p></p><p>Enjoy the process!</p><p></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="sable tireur, post: 3085941, member: 27307"] The traditional factory twist rate for the .257 rifle cartridges has been 1:10" for a long time. This is due to the prevalence of the shorter cup and core (lead) bullets. The current trend though has moved towards the longer, sleeker VLD bullets and the solids which are significantly longer than the lead core copper jacketed bullets. Longer bullets change the required twist rate to the 1:9" or even faster, some running as fast as 1:8.25" for copper solids in the 100 grain range. The discontinued 100 gr. Berger Classic Hunter needs a 1:9" for proper stability. In many cases simply stating a weight isn't as helpful as the bullet construction and the length of the bullet chosen. It's sometimes easier to run some of your data through the Berger Stability Calculator to do a 'what if' for the suggested twist rate before making a commitment to any bullet in particular. [URL]https://bergerbullets.com/twist-rate-calculator/[/URL] JBM Bullet Length List (not updated) [URL]https://jbmballistics.com/ballistics/lengths/lengths.shtml[/URL] Enjoy the process! :) [/QUOTE]
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