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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet weight vs length / barrel twist
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<blockquote data-quote="tim_w" data-source="post: 1045440" data-attributes="member: 11132"><p>This is very rudimentary as many factors of the bullet such as its shape also effect the stability but at its core........ The most overriding point to stability factor and or needed twist rate within a given caliber (bullet diameter) is the length of the bullet.Well length and density but most have it effect backwards on the later. Just because a bullet weighs more does not mean it will be moving at a slower velocity. That is a factor of the cartridge powder load barrel length. In fact bullet weight or more correctly density actually increases the stability factor for a given length. </p><p></p><p>Go to one of the bullet stability calculators and enter a vel, bullet length, and twist rate that will not stabilize the bullet. Now start upping the weight of the bullet and watch the stability factor go up and eventually the calculator will say its stabilized. This is why solid copper bullets of the same length as lead core even with the same being the same end up needing more spin to stabilize. Now for a given cartridge usually the lighter bullet will be pushed faster if loaded to and thus makes up the typical amounts but still weight or density decreases needed spin.</p></blockquote><p></p>
[QUOTE="tim_w, post: 1045440, member: 11132"] This is very rudimentary as many factors of the bullet such as its shape also effect the stability but at its core........ The most overriding point to stability factor and or needed twist rate within a given caliber (bullet diameter) is the length of the bullet.Well length and density but most have it effect backwards on the later. Just because a bullet weighs more does not mean it will be moving at a slower velocity. That is a factor of the cartridge powder load barrel length. In fact bullet weight or more correctly density actually increases the stability factor for a given length. Go to one of the bullet stability calculators and enter a vel, bullet length, and twist rate that will not stabilize the bullet. Now start upping the weight of the bullet and watch the stability factor go up and eventually the calculator will say its stabilized. This is why solid copper bullets of the same length as lead core even with the same being the same end up needing more spin to stabilize. Now for a given cartridge usually the lighter bullet will be pushed faster if loaded to and thus makes up the typical amounts but still weight or density decreases needed spin. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet weight vs length / barrel twist
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