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Do Bullets Go To Sleep?
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<blockquote data-quote="Kennibear" data-source="post: 888527" data-attributes="member: 51650"><p>MikeCr</p><p></p><p>Thanks for your response. It only raises a couple more questions:</p><p></p><p>1) Inferred in your response is the dampening of the wobble does not practically effect the LR hunter. But most of us have practical experience with ammo loaded with the bullets eccentrically off, i.e. bullet not straight in the case or with the bore (bent case neck). You are saying that the bullet "going to sleep" does not apply to sloppy bullet fit and we cannot count on that effect improving said ammo @ long range?</p><p></p><p>2) Does the change in Cd affect the BC of our bullets enough to increase the uncertainty (or create a variable) BC that compromises the predictability of the bullets path? Are our computer ballistics programs going to have a margin of error large enough to limit their accuracy for our purpose because of this?</p><p></p><p>3) Why not Cd instead of BC? Is the tide of Ballistics Research so ingrained in Ingall's original mathematical theories that we cannot change? Aerodynamics uses Cd and not a coefficient that adjusts the airfoil performance to match some arbitrary standard (G1/G7). The wind tunnel data generates a data curve (a data cloud really) across a range of Reynolds Numbers (think different velocities at different altitudes) and performance predictions are based on that. Our mathematics have always bugged me because we use BC's for maybe three ranges and none are accurate at correcting for form factor (to 1/10th of 1%) and so on and so forth. Cd seems a cleaner albeit mathematically more extensive solution. But we have computers today.</p><p></p><p>I'd better stop here or otherwise I'm going to have to type this up and submit it as a term paper.....</p><p></p><p>Thanks!</p><p></p><p>KB</p></blockquote><p></p>
[QUOTE="Kennibear, post: 888527, member: 51650"] MikeCr Thanks for your response. It only raises a couple more questions: 1) Inferred in your response is the dampening of the wobble does not practically effect the LR hunter. But most of us have practical experience with ammo loaded with the bullets eccentrically off, i.e. bullet not straight in the case or with the bore (bent case neck). You are saying that the bullet "going to sleep" does not apply to sloppy bullet fit and we cannot count on that effect improving said ammo @ long range? 2) Does the change in Cd affect the BC of our bullets enough to increase the uncertainty (or create a variable) BC that compromises the predictability of the bullets path? Are our computer ballistics programs going to have a margin of error large enough to limit their accuracy for our purpose because of this? 3) Why not Cd instead of BC? Is the tide of Ballistics Research so ingrained in Ingall's original mathematical theories that we cannot change? Aerodynamics uses Cd and not a coefficient that adjusts the airfoil performance to match some arbitrary standard (G1/G7). The wind tunnel data generates a data curve (a data cloud really) across a range of Reynolds Numbers (think different velocities at different altitudes) and performance predictions are based on that. Our mathematics have always bugged me because we use BC's for maybe three ranges and none are accurate at correcting for form factor (to 1/10th of 1%) and so on and so forth. Cd seems a cleaner albeit mathematically more extensive solution. But we have computers today. I'd better stop here or otherwise I'm going to have to type this up and submit it as a term paper..... Thanks! KB [/QUOTE]
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