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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Heavy bullets vs.light bullets
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<blockquote data-quote="Bart B" data-source="post: 655378" data-attributes="member: 5302"><p>No.</p><p></p><p>The answers each one gives depends on the formulas used in the software coupled with the BC values of a given bullet leaving at a given muzzle velocity. BC's derived from actual time of flight tests between two points are more accurate than those derived from weight and shape.</p><p></p><p>All bullets have a small range of BC's that vary with the velocity they are moving at. Air flow around a given bullet is not always exactly the same from muzzle to target. Sierra Bullets list as many as 5 BC's for some bullets in 5 different velocity bands. Other bullet companies as far as I know, list only 1 BC for each of their bullets. Sierra's software allows different BC's and velocity bands for each BC a bullet has in each of those bands. I don't think other software does.</p><p></p><p>In my own tests from measured bullet velocities, sight movements and atmospheric conditions, Sierra's software has produced sight settings for ranges up to 1000 yards within 1/2 MOA of exact for several of their 30 caliber match bullets at different muzzle velocities. For me, that's about as accurate as one can get.</p><p></p><p>Using a few other ballistic software sets I've tried, the drop numbers vary somewhat compared to Sierra's. Berger Bullets' software is the closest to what Sierra's gives for answers.</p><p></p><p>Do your own experiments and use what you're comfortable with.</p></blockquote><p></p>
[QUOTE="Bart B, post: 655378, member: 5302"] No. The answers each one gives depends on the formulas used in the software coupled with the BC values of a given bullet leaving at a given muzzle velocity. BC's derived from actual time of flight tests between two points are more accurate than those derived from weight and shape. All bullets have a small range of BC's that vary with the velocity they are moving at. Air flow around a given bullet is not always exactly the same from muzzle to target. Sierra Bullets list as many as 5 BC's for some bullets in 5 different velocity bands. Other bullet companies as far as I know, list only 1 BC for each of their bullets. Sierra's software allows different BC's and velocity bands for each BC a bullet has in each of those bands. I don't think other software does. In my own tests from measured bullet velocities, sight movements and atmospheric conditions, Sierra's software has produced sight settings for ranges up to 1000 yards within 1/2 MOA of exact for several of their 30 caliber match bullets at different muzzle velocities. For me, that's about as accurate as one can get. Using a few other ballistic software sets I've tried, the drop numbers vary somewhat compared to Sierra's. Berger Bullets' software is the closest to what Sierra's gives for answers. Do your own experiments and use what you're comfortable with. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Heavy bullets vs.light bullets
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