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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Corkscrew vapor trail????
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<blockquote data-quote="BryanLitz" data-source="post: 1123608" data-attributes="member: 7848"><p>Remember that the trace you see is not the actual bullet, but the disturbance left in the air from the bullet. As such, the trace is carried by the air/wind in whatever direction it's blowing. </p><p></p><p>In other words, if you're shooting thru a swirl or eddie in the wind, the bullet may not be deflected enough to see or notice, but the trace you're seeing is.</p><p></p><p>Epicyclic swerve is a real thing, but happens to a much smaller magnitude than most realize. The swerve radius is typically 10% of the caliber or less, so like 0.030" for a .30 caliber bullet. Not enough to see. Epicyclic swerve can happen for bullets that are fully stable. If their's a tip-off at the muzzle and the bullet has to settle down, that's where the very minor corkscrew flight path (epicyclic swerve) comes in. But again, it's not likely you were seeing this, but rather the trace blowing in the wind.</p><p></p><p>-Bryan</p></blockquote><p></p>
[QUOTE="BryanLitz, post: 1123608, member: 7848"] Remember that the trace you see is not the actual bullet, but the disturbance left in the air from the bullet. As such, the trace is carried by the air/wind in whatever direction it's blowing. In other words, if you're shooting thru a swirl or eddie in the wind, the bullet may not be deflected enough to see or notice, but the trace you're seeing is. Epicyclic swerve is a real thing, but happens to a much smaller magnitude than most realize. The swerve radius is typically 10% of the caliber or less, so like 0.030" for a .30 caliber bullet. Not enough to see. Epicyclic swerve can happen for bullets that are fully stable. If their's a tip-off at the muzzle and the bullet has to settle down, that's where the very minor corkscrew flight path (epicyclic swerve) comes in. But again, it's not likely you were seeing this, but rather the trace blowing in the wind. -Bryan [/QUOTE]
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Corkscrew vapor trail????
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