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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet Spin and Performance
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<blockquote data-quote="Lightvarmint" data-source="post: 248556"><p>Roy,</p><p></p><p>Thanks for posting the links of those videos.......... </p><p></p><p>What was the twist of the barrel it was shot from and what was the bullet speed? The reason I am asking is because the bullet was in "yaw" when it penetrated the paper target..... The hole is substantially oblong in shape along the "y" axis (vertical). Additionally, it appears that the boat tail even cut a portion of the hole and it is not even part of the major bullet diameter.</p><p></p><p>If you look close, you can see the paper rotating as it tears away from center of the bullet while it is opening to allow the projectile through. When I shoot bullets out of the 1-8" twist at say 3400 fps, you can see the evidence that the land marks on the bullet actually torque and wrinkle the plastic as it goes through..... We do not see it with 1-10" twist barrels.</p><p></p><p>The eight cutting spirals in the gelatin are a great catch, thanks for verifying what we theorized about. You have taken the "theory" to the level of theorem and rule of thumb. Thanks a lot for the support. You are the hero of the day.</p><p></p><p>James</p></blockquote><p></p>
[QUOTE="Lightvarmint, post: 248556"] Roy, Thanks for posting the links of those videos.......... What was the twist of the barrel it was shot from and what was the bullet speed? The reason I am asking is because the bullet was in "yaw" when it penetrated the paper target..... The hole is substantially oblong in shape along the "y" axis (vertical). Additionally, it appears that the boat tail even cut a portion of the hole and it is not even part of the major bullet diameter. If you look close, you can see the paper rotating as it tears away from center of the bullet while it is opening to allow the projectile through. When I shoot bullets out of the 1-8" twist at say 3400 fps, you can see the evidence that the land marks on the bullet actually torque and wrinkle the plastic as it goes through..... We do not see it with 1-10" twist barrels. The eight cutting spirals in the gelatin are a great catch, thanks for verifying what we theorized about. You have taken the "theory" to the level of theorem and rule of thumb. Thanks a lot for the support. You are the hero of the day. James [/QUOTE]
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