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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
BC Decay Rate
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<blockquote data-quote="cronhelm" data-source="post: 20954" data-attributes="member: 98"><p>Warren,</p><p></p><p>We should start calling you "Answer Man".</p><p></p><p>So how does one know if a certain bullet is properly balanced? I would make the assumption that most VLD bullets are better balanced than conventional designs but this does not mean that a given VLD design is properly balanced.</p><p></p><p>Sierra lists varying BC figures for their bullets at different velocities. Is this a function of precession and BC decay or do bullets really exhibit changin BC values at different velocities?</p><p></p><p>Arrrrghhh! My brain is starting to hurt!</p><p></p><p>I ran into a very strange phenomenon the other day. As expected, at 1900 yards the round hit quite a bit low as predicted by the ballistics computer.</p><p></p><p>However, on another day, at a much different temperature, the round hit about 8 MOA high at 1500 yds. Same exact round, load and rifle. Wierd!</p><p></p><p>I have only been out once so have not noticed if this is simply a wierd set of circumstances or an indication of something consistent.</p><p></p><p>FWIW the bullet is a 6mm Berger 95gr VLD shot through a 1:8 twist barrel at 3280 fps. Temperature was 80F at 3900 ft elevation</p><p></p><p>Peter Cronhelm</p></blockquote><p></p>
[QUOTE="cronhelm, post: 20954, member: 98"] Warren, We should start calling you "Answer Man". So how does one know if a certain bullet is properly balanced? I would make the assumption that most VLD bullets are better balanced than conventional designs but this does not mean that a given VLD design is properly balanced. Sierra lists varying BC figures for their bullets at different velocities. Is this a function of precession and BC decay or do bullets really exhibit changin BC values at different velocities? Arrrrghhh! My brain is starting to hurt! I ran into a very strange phenomenon the other day. As expected, at 1900 yards the round hit quite a bit low as predicted by the ballistics computer. However, on another day, at a much different temperature, the round hit about 8 MOA high at 1500 yds. Same exact round, load and rifle. Wierd! I have only been out once so have not noticed if this is simply a wierd set of circumstances or an indication of something consistent. FWIW the bullet is a 6mm Berger 95gr VLD shot through a 1:8 twist barrel at 3280 fps. Temperature was 80F at 3900 ft elevation Peter Cronhelm [/QUOTE]
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BC Decay Rate
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