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Barrel twist equals stabilization: Truth, lies, myths, total BS, basic guidelines or some is and some aint?
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<blockquote data-quote="jebel" data-source="post: 2511317" data-attributes="member: 106189"><p>Rather than relying on hearsay for what twist rate will stabilize a particular bullet, before you buy plug the figures into an online calculator.</p><p></p><p>JBM's calculator is here: <a href="https://www.jbmballistics.com/cgi-bin/jbmstab-5.1.cgi" target="_blank">https://www.jbmballistics.com/cgi-bin/jbmstab-5.1.cgi</a></p><p></p><p>If you need the length of the bullet for the calculation, you can get that from JBM also, here: <a href="https://www.jbmballistics.com/ballistics/lengths/lengths.shtml" target="_blank">https://www.jbmballistics.com/ballistics/lengths/lengths.shtml</a></p><p></p><p>Plugging in the 110g Sierra Matchking (.243) with a bullet length of 1.335 inches and a velocity of 2,863 fps in a 1:8 twist barrel results in a stability factor of 1.248 at sea level. That's too low, in my book. I want to see at least 1.5 or above. FYI, the the 107g Sierra Matchking should stabilize in a 1:8 twist (stability factor above 1.5).</p><p></p><p>Last, you should manually check that new barrel's twist rate. It might not actually be 1:8.</p></blockquote><p></p>
[QUOTE="jebel, post: 2511317, member: 106189"] Rather than relying on hearsay for what twist rate will stabilize a particular bullet, before you buy plug the figures into an online calculator. JBM's calculator is here: [URL]https://www.jbmballistics.com/cgi-bin/jbmstab-5.1.cgi[/URL] If you need the length of the bullet for the calculation, you can get that from JBM also, here: [URL]https://www.jbmballistics.com/ballistics/lengths/lengths.shtml[/URL] Plugging in the 110g Sierra Matchking (.243) with a bullet length of 1.335 inches and a velocity of 2,863 fps in a 1:8 twist barrel results in a stability factor of 1.248 at sea level. That's too low, in my book. I want to see at least 1.5 or above. FYI, the the 107g Sierra Matchking should stabilize in a 1:8 twist (stability factor above 1.5). Last, you should manually check that new barrel's twist rate. It might not actually be 1:8. [/QUOTE]
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Barrel twist equals stabilization: Truth, lies, myths, total BS, basic guidelines or some is and some aint?
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