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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Berger Twist Rate Stability Calculator (need help)
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<blockquote data-quote="jebel" data-source="post: 2023702" data-attributes="member: 106189"><p>The Berger twist calculator works fine, but it does not include a variable for polymer tipped bullets (Berger doesn't sell any). The polymer tip affects the calculation. Generally the Berger calculator will overestimate the twist necessary to stabilize bullets with polymer tips.</p><p></p><p>For Hornady ELD-X bullets (polymer tip), use the JBM calculator.</p><p>[URL unfurl="true"]https://www.jbmballistics.com/cgi-bin/jbmstab-5.1.cgi[/URL]</p><p></p><p>If you need to know the length of the polymer tip itself, measure it or use the JBM bullet length list.</p><p>[URL unfurl="true"]https://www.jbmballistics.com/ballistics/lengths/lengths.shtml#Hornady[/URL]</p><p></p><p>An SG value of 1.5+ at sea level conditions is generally considered fully stabilized. There is some debate over how high you want to go with the SG value, which you can research on this website or ask about.</p></blockquote><p></p>
[QUOTE="jebel, post: 2023702, member: 106189"] The Berger twist calculator works fine, but it does not include a variable for polymer tipped bullets (Berger doesn't sell any). The polymer tip affects the calculation. Generally the Berger calculator will overestimate the twist necessary to stabilize bullets with polymer tips. For Hornady ELD-X bullets (polymer tip), use the JBM calculator. [URL unfurl="true"]https://www.jbmballistics.com/cgi-bin/jbmstab-5.1.cgi[/URL] If you need to know the length of the polymer tip itself, measure it or use the JBM bullet length list. [URL unfurl="true"]https://www.jbmballistics.com/ballistics/lengths/lengths.shtml#Hornady[/URL] An SG value of 1.5+ at sea level conditions is generally considered fully stabilized. There is some debate over how high you want to go with the SG value, which you can research on this website or ask about. [/QUOTE]
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Berger Twist Rate Stability Calculator (need help)
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