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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
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<blockquote data-quote="Fiftydriver" data-source="post: 144326" data-attributes="member: 10"><p>If you look at the Sierra listings of their projected BCs for their line of bullets, you will notice that some bullets have a drop in BC as they slow down, others will have an increase in BC as they slow. Still others will increase in BC to a certain point and then taper off just as you see with the example you list.</p><p></p><p>I have found that as most bullets approach the lower limits of super sonic velocity, they tend to become unstable. This instablity will translate into much lower BC because the bullet can not travel as efficently through the air because it is not fully stablized.</p><p></p><p>As a result it decelorates quicker and is blown off by the wind more.</p><p></p><p>This tends to be the case with most bullets.</p><p></p><p>Personally, I see nothing here that would make me agree with Triggerfifty that a bullet launched at higher velocity will decelorate faster then a bullet fired at lower velocity.</p><p></p><p>We had big debate over that and in my opinion a quality explination for his theory was never offered. If you take two bullets of identical design and weight and BC and launch one at 3500 fps and the other at 3300 fps, The faster starting bullet will always be faster down range.</p><p></p><p>I have yet to ever hear anything that disproves this.</p><p></p><p>Simply put, the BC of a bullet is continually changing as the bullet travels through its trajectory and velocity range. This change will be unique in most cases to each bullet design.</p><p></p><p>Just my opinion.</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 144326, member: 10"] If you look at the Sierra listings of their projected BCs for their line of bullets, you will notice that some bullets have a drop in BC as they slow down, others will have an increase in BC as they slow. Still others will increase in BC to a certain point and then taper off just as you see with the example you list. I have found that as most bullets approach the lower limits of super sonic velocity, they tend to become unstable. This instablity will translate into much lower BC because the bullet can not travel as efficently through the air because it is not fully stablized. As a result it decelorates quicker and is blown off by the wind more. This tends to be the case with most bullets. Personally, I see nothing here that would make me agree with Triggerfifty that a bullet launched at higher velocity will decelorate faster then a bullet fired at lower velocity. We had big debate over that and in my opinion a quality explination for his theory was never offered. If you take two bullets of identical design and weight and BC and launch one at 3500 fps and the other at 3300 fps, The faster starting bullet will always be faster down range. I have yet to ever hear anything that disproves this. Simply put, the BC of a bullet is continually changing as the bullet travels through its trajectory and velocity range. This change will be unique in most cases to each bullet design. Just my opinion. Kirby Allen(50) [/QUOTE]
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