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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Stability: Fine Points to be Aware Of
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<blockquote data-quote="nralifer" data-source="post: 2634481" data-attributes="member: 94556"><p>What does barrel twist due to a bullet? It causes to spin, right? That spin rate is expressed in rpm. As you increase the number of turns in a shorter distance (barrel twist rate) inevitably the spin rate has to increase. As you increase the forward speed of the bullet for a given twist rate, the number of rotations the bullet does per unit time has to increase, thus the SG number increases as does the bullet stability. Since stability is also a function of the density of the air, decreasing as the air desity increases, one requires a faster spin rate to achieve stability. When the spining bullet suddenly enters a much denser medium, the flesh of the target animal, the bullet becomes less stable. If the bullet is marginally stable in air it will inevitably become unstable when encountering a suddenly denser medium and start to tumble. That tumbling will cause an erratic path of bullet penetration which inevitably affects terminal performance.</p></blockquote><p></p>
[QUOTE="nralifer, post: 2634481, member: 94556"] What does barrel twist due to a bullet? It causes to spin, right? That spin rate is expressed in rpm. As you increase the number of turns in a shorter distance (barrel twist rate) inevitably the spin rate has to increase. As you increase the forward speed of the bullet for a given twist rate, the number of rotations the bullet does per unit time has to increase, thus the SG number increases as does the bullet stability. Since stability is also a function of the density of the air, decreasing as the air desity increases, one requires a faster spin rate to achieve stability. When the spining bullet suddenly enters a much denser medium, the flesh of the target animal, the bullet becomes less stable. If the bullet is marginally stable in air it will inevitably become unstable when encountering a suddenly denser medium and start to tumble. That tumbling will cause an erratic path of bullet penetration which inevitably affects terminal performance. [/QUOTE]
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Stability: Fine Points to be Aware Of
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