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Long Range Hunting & Shooting
Bullets, twist and 264wm
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<blockquote data-quote="GLTaylor" data-source="post: 2526275" data-attributes="member: 111593"><p>The nice thing about Hammers is you can't overspin them. At least, so far we haven't been able to destroy one. There are actually 2 things to consider here: bullet stability in flight, and terminal stability. They are very different. The standard for stability of a bullet in flight is generally accepted to be about 1.5. This keeps the bullet nose oriented correctly forward in flight. When the bullet impacts flesh/bone, different dynamics come into play. So far there is no way to calculate terminal stability. A group of people are conducting on-animal evaluations of bullet performance (wound channel size and depth), straightness of bullet travel and penetration distance. These studies are indicating that Much higher stability factors are beneficial! Higher stability factors (2-5+) aid in keeping the bullet oriented nose first (not tumbling) as it drills through flesh and bone. Over spinning a mono bullet has no detrimental effects. Cup and core lead bullets can come apart or perform very poorly above a certain RPM rate. Monos don't have this limitation. As people rebarrel or build new rifles, many are going to much faster twists. 8 twist is slow for some. 7 - 7.5 is becoming more common, even up to .375 caliber<img class="smilie smilie--emoji" loading="lazy" alt="😄" title="Grinning face with smiling eyes :smile:" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f604.png" data-shortname=":smile:" /></p></blockquote><p></p>
[QUOTE="GLTaylor, post: 2526275, member: 111593"] The nice thing about Hammers is you can't overspin them. At least, so far we haven't been able to destroy one. There are actually 2 things to consider here: bullet stability in flight, and terminal stability. They are very different. The standard for stability of a bullet in flight is generally accepted to be about 1.5. This keeps the bullet nose oriented correctly forward in flight. When the bullet impacts flesh/bone, different dynamics come into play. So far there is no way to calculate terminal stability. A group of people are conducting on-animal evaluations of bullet performance (wound channel size and depth), straightness of bullet travel and penetration distance. These studies are indicating that Much higher stability factors are beneficial! Higher stability factors (2-5+) aid in keeping the bullet oriented nose first (not tumbling) as it drills through flesh and bone. Over spinning a mono bullet has no detrimental effects. Cup and core lead bullets can come apart or perform very poorly above a certain RPM rate. Monos don't have this limitation. As people rebarrel or build new rifles, many are going to much faster twists. 8 twist is slow for some. 7 - 7.5 is becoming more common, even up to .375 caliber😄 [/QUOTE]
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