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Rifles, Reloading, Optics, Equipment
Reloading
Hammer Bullets and twist recommendations
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<blockquote data-quote="Hand Skills" data-source="post: 2362106" data-attributes="member: 103303"><p>Revolutions Per Minute has more to do with stresses on the bullet - at a certain threshold (north of 300,000rpm) cup and core bullets tend to come apart.</p><p></p><p>Hammers do not suffer this phenomenon</p><p></p><p>When it comes to stability, Revolutions Per Distance is the key.</p><p></p><p>My understanding is that as atmospheric pressure increases the center of pressure moves forward on the projectile, effectively increasing the leverage (due to the resistance of the medium - in this case atmosphere) on the bullet relative to the center of gravity.</p><p></p><p>-colder temperature increases air density</p><p>-lower elevation increases air density</p><p></p><p>This is observable with a barometer.</p><p></p><p>As air density increases, more Revolutions per Distance (a faster twist) is needed to achieve a given stability factor.</p></blockquote><p></p>
[QUOTE="Hand Skills, post: 2362106, member: 103303"] Revolutions Per Minute has more to do with stresses on the bullet - at a certain threshold (north of 300,000rpm) cup and core bullets tend to come apart. Hammers do not suffer this phenomenon When it comes to stability, Revolutions Per Distance is the key. My understanding is that as atmospheric pressure increases the center of pressure moves forward on the projectile, effectively increasing the leverage (due to the resistance of the medium - in this case atmosphere) on the bullet relative to the center of gravity. -colder temperature increases air density -lower elevation increases air density This is observable with a barometer. As air density increases, more Revolutions per Distance (a faster twist) is needed to achieve a given stability factor. [/QUOTE]
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Hammer Bullets and twist recommendations
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