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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
sleepy bullets and group size
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<blockquote data-quote="Blaine Fields" data-source="post: 32015" data-attributes="member: 183"><p>I've seen a number of attempts to explain this apparent phenomenon, but I think that the answer may lie in a topic that I've never seen discussed in these forums. The cause may originate from "aerodynamic jump" which is a lateral displacement of the bullet that occurs at the muzzle due to bullet tip in the chamber, i.e., the lack of concentricity of the bullet and the bore. As I understand it, the bullet exits the muzzle and immediately must deal with an abnormally high yaw angle. This angle causes a sideways movement, but then the bullet stabilizes and heads down range. The jump is not trivial in terms of distance and may explain why group size in terms of MOA can actually get smaller with range.</p><p></p><p>[ 02-28-2004: Message edited by: Blaine Fields ]</p></blockquote><p></p>
[QUOTE="Blaine Fields, post: 32015, member: 183"] I've seen a number of attempts to explain this apparent phenomenon, but I think that the answer may lie in a topic that I've never seen discussed in these forums. The cause may originate from "aerodynamic jump" which is a lateral displacement of the bullet that occurs at the muzzle due to bullet tip in the chamber, i.e., the lack of concentricity of the bullet and the bore. As I understand it, the bullet exits the muzzle and immediately must deal with an abnormally high yaw angle. This angle causes a sideways movement, but then the bullet stabilizes and heads down range. The jump is not trivial in terms of distance and may explain why group size in terms of MOA can actually get smaller with range. [ 02-28-2004: Message edited by: Blaine Fields ] [/QUOTE]
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sleepy bullets and group size
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