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Hunting
Long Range Hunting & Shooting
KEY HOLE PROBLEM
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<blockquote data-quote="Hugnot" data-source="post: 1998379" data-attributes="member: 115658"><p>The Hornady 4DOF calculator defaults to a 7 twist for that bullet giving a "gyro" value of 2.17 at 2900 fps, at muzzle. My guess, from looking at the target that shows a funny looking bullet hole ("L" shaped) is that the bullet jacket failed. The long skinny 147 needs a fast twist to stabilize. The 4DOF calculator with an 8 twist comes up with a "gyro" value of 1.66 at muzzle. Both values using default environment values. Spinning like crazy but as needed for stability.</p></blockquote><p></p>
[QUOTE="Hugnot, post: 1998379, member: 115658"] The Hornady 4DOF calculator defaults to a 7 twist for that bullet giving a "gyro" value of 2.17 at 2900 fps, at muzzle. My guess, from looking at the target that shows a funny looking bullet hole ("L" shaped) is that the bullet jacket failed. The long skinny 147 needs a fast twist to stabilize. The 4DOF calculator with an 8 twist comes up with a "gyro" value of 1.66 at muzzle. Both values using default environment values. Spinning like crazy but as needed for stability. [/QUOTE]
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