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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Have any of you seen "magic" like this?
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<blockquote data-quote="BryanLitz" data-source="post: 251123" data-attributes="member: 7848"><p>Using drop to calculate BC is a risky thing. The uncertainties in group center, consistency of sight adjustments, vertical wind currents, and other less well known tangibles can cause HUGE swings in a BC that's calculated from observed drop. It can be done, but it has to be a carefully controlled and sterile test environment which most of the time it isn't.</p><p>I'm not 'callin you out', but I personally don't believe that a projectile can magically achieve any kind of supernatural drag reduction that would cause it to fly with a much higher BC than other similarly shaped bullets. I DO believe that conditions can exist that can REDUCE the effective BC of a bullet fired from a particular barrel like marginal gyroscopic stability and excessive initial yaw rate induced by barrel whip. However, when a bullet is fired with adequate stability, and it flies with no yaw thru the atmosphere, that bullet still has to pay the energy bill it takes to make all that noise and heat. It pays with work (forceXdistance), and that energy is subtracted from the bullets kinetic energy. There's no way around it, even if we think we're seeing it.</p><p>I have seen things that were inconsistent and gave me pause on occasion, but something usually surfaces that explains it like a misreading chronograph, or some other malfunctioning piece of instrumentation. I have no problem dismissing the measurements that defy the law of conservation of energy whether I discover the exact cause of the error or not.</p><p>-Bryan</p></blockquote><p></p>
[QUOTE="BryanLitz, post: 251123, member: 7848"] Using drop to calculate BC is a risky thing. The uncertainties in group center, consistency of sight adjustments, vertical wind currents, and other less well known tangibles can cause HUGE swings in a BC that's calculated from observed drop. It can be done, but it has to be a carefully controlled and sterile test environment which most of the time it isn't. I'm not 'callin you out', but I personally don't believe that a projectile can magically achieve any kind of supernatural drag reduction that would cause it to fly with a much higher BC than other similarly shaped bullets. I DO believe that conditions can exist that can REDUCE the effective BC of a bullet fired from a particular barrel like marginal gyroscopic stability and excessive initial yaw rate induced by barrel whip. However, when a bullet is fired with adequate stability, and it flies with no yaw thru the atmosphere, that bullet still has to pay the energy bill it takes to make all that noise and heat. It pays with work (forceXdistance), and that energy is subtracted from the bullets kinetic energy. There's no way around it, even if we think we're seeing it. I have seen things that were inconsistent and gave me pause on occasion, but something usually surfaces that explains it like a misreading chronograph, or some other malfunctioning piece of instrumentation. I have no problem dismissing the measurements that defy the law of conservation of energy whether I discover the exact cause of the error or not. -Bryan [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Have any of you seen "magic" like this?
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