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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet lift, does it exist?
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<blockquote data-quote="Fiftydriver" data-source="post: 176841" data-attributes="member: 10"><p>THis is an interesting and very complicated topic for sure. Well over my head ballistically.</p><p> </p><p>However, I have read some extensive studies on 50 cal projectiles tested down on the Yuma test range using radar ballistic equipment at exteme range. They were also able to recover bullets from these tests and found some very interesting things out about bullet flight.</p><p> </p><p>The main thing that effected bullet flight was twist rate from their testing and results. Rifles that had the standard 1-15 twist would have bullets that would travel, meplat on line with trajectory. Meaning that as the bullet traveled its trajectory, the point of the bullet nose would stay on point with the path of the bullet. This was determined by recovering the bullets from the sand fields they were fired into and studing the abrasion on the bullets from impact. The majority of bullet damage was at the front of the bullet.</p><p> </p><p>When they tested some fast twist barrels in the 50 BMG, the results were much different. These were 1-9.5 twist barrels. The results were similiar for all bullet designs, conventional lead core to solids. When the bullets were fired, the bullets nose would stay relatively on track until the bullet began to drop noticably. Instead of the nose following the trajectory path as the bullets from the 1-15 twist barrels die, these bullets remained flat or actually nose up in flight. This was determined by the fact that all recovered bullets had abrasion on the sides and rear of the bullets with no serious damage to the nose of the bullets.</p><p> </p><p>How did this effect maximum range potential, not dramatically but at extreme range, the stadnard twist barrels did drop significantly faster then the fast twist barreled bullets.</p><p> </p><p>They did not come right out and say this was due to "lift". What they did say however was that this was more likely a result of higher BC at extended range because the bullet remained "point into the wind" if you will compared to the standard twist bullets that had "point on trajectory" behavior. Basically saying that the higher RPM bullets had higher BC at extreme range. When I say extreme range I am talking in the +2500 yard range.</p><p> </p><p>Interestly enough, they had lower BC at close range(sub 1000 yards).</p><p> </p><p>Not sure if this adds anything meaningful but it was an interesting read.</p><p> </p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 176841, member: 10"] THis is an interesting and very complicated topic for sure. Well over my head ballistically. However, I have read some extensive studies on 50 cal projectiles tested down on the Yuma test range using radar ballistic equipment at exteme range. They were also able to recover bullets from these tests and found some very interesting things out about bullet flight. The main thing that effected bullet flight was twist rate from their testing and results. Rifles that had the standard 1-15 twist would have bullets that would travel, meplat on line with trajectory. Meaning that as the bullet traveled its trajectory, the point of the bullet nose would stay on point with the path of the bullet. This was determined by recovering the bullets from the sand fields they were fired into and studing the abrasion on the bullets from impact. The majority of bullet damage was at the front of the bullet. When they tested some fast twist barrels in the 50 BMG, the results were much different. These were 1-9.5 twist barrels. The results were similiar for all bullet designs, conventional lead core to solids. When the bullets were fired, the bullets nose would stay relatively on track until the bullet began to drop noticably. Instead of the nose following the trajectory path as the bullets from the 1-15 twist barrels die, these bullets remained flat or actually nose up in flight. This was determined by the fact that all recovered bullets had abrasion on the sides and rear of the bullets with no serious damage to the nose of the bullets. How did this effect maximum range potential, not dramatically but at extreme range, the stadnard twist barrels did drop significantly faster then the fast twist barreled bullets. They did not come right out and say this was due to "lift". What they did say however was that this was more likely a result of higher BC at extended range because the bullet remained "point into the wind" if you will compared to the standard twist bullets that had "point on trajectory" behavior. Basically saying that the higher RPM bullets had higher BC at extreme range. When I say extreme range I am talking in the +2500 yard range. Interestly enough, they had lower BC at close range(sub 1000 yards). Not sure if this adds anything meaningful but it was an interesting read. Kirby Allen(50) [/QUOTE]
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Bullet lift, does it exist?
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