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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet stabilization, strictly RPM?
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<blockquote data-quote="Mikecr" data-source="post: 170871" data-attributes="member: 1521"><p>No, effective twist rate changes down range.</p><p>For example, a 95vld launched at 3000fps and 1:10tw will have dropped to ~2130fps at 500yds(BC of .505). </p><p>The bullet RPMs have only dropped off slightly at ~18rpm per fps of velocity loss. So the effective twist rate at 500yds is now 1:7.7</p><p></p><p>This bullet had an Sg at the muzzle of 1.3, but at 500yds it's Sg has climbed to 1.9</p><p></p><p>At 1000yds the effective twist would be 1:5.5, and Sg would be 3.8</p></blockquote><p></p>
[QUOTE="Mikecr, post: 170871, member: 1521"] No, effective twist rate changes down range. For example, a 95vld launched at 3000fps and 1:10tw will have dropped to ~2130fps at 500yds(BC of .505). The bullet RPMs have only dropped off slightly at ~18rpm per fps of velocity loss. So the effective twist rate at 500yds is now 1:7.7 This bullet had an Sg at the muzzle of 1.3, but at 500yds it's Sg has climbed to 1.9 At 1000yds the effective twist would be 1:5.5, and Sg would be 3.8 [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet stabilization, strictly RPM?
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