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Rifles, Reloading, Optics, Equipment
Reloading
How fast, and what weight, must a bullet run to stabilize in a 6 mm , 14 twist barrel?
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<blockquote data-quote="Hugnot" data-source="post: 2192200" data-attributes="member: 115658"><p>The little plastic tips do affect stability.</p><p></p><p>[ATTACH=full]272775[/ATTACH]</p><p></p><p>The formula op is "((92-C93)/C90)^2)) What this is: (( bullet length-tip length) / caliber) squared)).</p><p></p><p>Don Miller devised this method. <a href="https://en.wikipedia.org/wiki/Miller_twist_rule" target="_blank">https://en.wikipedia.org/wiki/Miller_twist_rule</a></p><p></p><p>The plastic tips are not weightless and some provision was needed to come up with a Sg (estimated) for the plastic tips.</p><p><a href="https://arxiv.org/abs/1410.5737" target="_blank">https://arxiv.org/abs/1410.5737</a> , Michael Courteney </p><p></p><p>I use the 53 V-Max ® on rodents out of a 9 twist .223 loaded with CFE223 and it sort of shoots like a .22-.250, like many hits at 400 on small rodents.</p><p></p><p>[ATTACH=full]272785[/ATTACH]</p><p></p><p>But with a 14 twist:</p><p></p><p>[ATTACH=full]272786[/ATTACH]</p><p></p><p>An estimated Sg of 1.05 would sure make for "oval" (real bad) bullet holes. Not slower than 12 twist looks good for the .224 53 V-Max®. </p><p></p><p>I hope to shoot some deers with the 6.5 140 SST® from my old 6.5-.308 (pre .260) and needed to avoid oval bullet holes in Nov-Dec temps.</p></blockquote><p></p>
[QUOTE="Hugnot, post: 2192200, member: 115658"] The little plastic tips do affect stability. [ATTACH type="full"]272775[/ATTACH] The formula op is "((92-C93)/C90)^2)) What this is: (( bullet length-tip length) / caliber) squared)). Don Miller devised this method. [URL]https://en.wikipedia.org/wiki/Miller_twist_rule[/URL] The plastic tips are not weightless and some provision was needed to come up with a Sg (estimated) for the plastic tips. [URL]https://arxiv.org/abs/1410.5737[/URL] , Michael Courteney I use the 53 V-Max ® on rodents out of a 9 twist .223 loaded with CFE223 and it sort of shoots like a .22-.250, like many hits at 400 on small rodents. [ATTACH type="full"]272785[/ATTACH] But with a 14 twist: [ATTACH type="full"]272786[/ATTACH] An estimated Sg of 1.05 would sure make for "oval" (real bad) bullet holes. Not slower than 12 twist looks good for the .224 53 V-Max®. I hope to shoot some deers with the 6.5 140 SST® from my old 6.5-.308 (pre .260) and needed to avoid oval bullet holes in Nov-Dec temps. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
How fast, and what weight, must a bullet run to stabilize in a 6 mm , 14 twist barrel?
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