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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
my method
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<blockquote data-quote="Lightvarmint" data-source="post: 247693"><p>Hello again,</p><p></p><p>At 3000 fps, the bullet rpm out of a 1-8" twist is 270,000 rpm and at 3000 fps the bullet rpm out of a 1-10" twist is 216,000 rpm.</p><p></p><p>At 2500 fps, the bullet rpm out of a 1-8" twist is 225,000 rpm and at 2500 fps the bullet rpm out of a 1-10" twist is 180,000 rpm.</p><p></p><p>In reality and in some cases, you can over come lack of twist with more speed. But, you are on or closer to the ragged edge. All the bullet needs is enough spin to create a stable environment. During the bullet flight, the velocity decrease is not in the same proportion as the decay of the rpm. RPM decays at a much lesser rate than the what one sees as the bullet slows to a halt. And, at the point where the bullet's flight is overcome by gravity and actually halts in flight over land and touches the earth, it still has gyroscopic spin. If this were not the case, we would not be able to shoot longer distances without fin stabilization.</p><p></p><p>When the bullet starts to deform and expand, it acts very much like a drill bit. It actually cuts a hole and if it deforms enough, it can spin portions of the jacket throughout the material that caused it to deform. Some folks even use metal detectors to locate the pieces of schrapnel. Rotational spin actually aids in creating the wound channel.</p><p></p><p>Finally, the actual bullet rotational spin is what causes the bullet to be stable. Sort of like a top that you spin on the floor. The faster it spins the more stable the top. Basically, bullets follow this same principle.</p><p></p><p>Anyway, some folks don't realize the speed at which these projectiles we shoot actually rotate. Even more interesting is that they get accelerated over a short distance...... Just think of the torque that they see when traveling down the barrel.</p><p></p><p>Lightvarmint</p></blockquote><p></p>
[QUOTE="Lightvarmint, post: 247693"] Hello again, At 3000 fps, the bullet rpm out of a 1-8" twist is 270,000 rpm and at 3000 fps the bullet rpm out of a 1-10" twist is 216,000 rpm. At 2500 fps, the bullet rpm out of a 1-8" twist is 225,000 rpm and at 2500 fps the bullet rpm out of a 1-10" twist is 180,000 rpm. In reality and in some cases, you can over come lack of twist with more speed. But, you are on or closer to the ragged edge. All the bullet needs is enough spin to create a stable environment. During the bullet flight, the velocity decrease is not in the same proportion as the decay of the rpm. RPM decays at a much lesser rate than the what one sees as the bullet slows to a halt. And, at the point where the bullet's flight is overcome by gravity and actually halts in flight over land and touches the earth, it still has gyroscopic spin. If this were not the case, we would not be able to shoot longer distances without fin stabilization. When the bullet starts to deform and expand, it acts very much like a drill bit. It actually cuts a hole and if it deforms enough, it can spin portions of the jacket throughout the material that caused it to deform. Some folks even use metal detectors to locate the pieces of schrapnel. Rotational spin actually aids in creating the wound channel. Finally, the actual bullet rotational spin is what causes the bullet to be stable. Sort of like a top that you spin on the floor. The faster it spins the more stable the top. Basically, bullets follow this same principle. Anyway, some folks don't realize the speed at which these projectiles we shoot actually rotate. Even more interesting is that they get accelerated over a short distance...... Just think of the torque that they see when traveling down the barrel. Lightvarmint [/QUOTE]
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