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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Ballistic coeficient question with data
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<blockquote data-quote="Jon A" data-source="post: 91759" data-attributes="member: 319"><p>Certainly true, but I think an accurate, measured average BC over the first 200 yds will give better data than 99% of us are using. 50, even 100, probably not as the bullet could still straighten out significantly, but 200 is pretty good IMHO. Those first 200 yds are where drag forces are the highest and the BC during this period has cumulative effects (even at 1000+ the flight of the bullet has still been significantly affected by its BC during the first 200 yds).</p><p></p><p>In any case, virtually all of Sierra's published BC's are average BC's from measuring over the first 150 yds. It's just pretty impractical to measure them at really long ranges, even with an underground range.</p></blockquote><p></p>
[QUOTE="Jon A, post: 91759, member: 319"] Certainly true, but I think an accurate, measured average BC over the first 200 yds will give better data than 99% of us are using. 50, even 100, probably not as the bullet could still straighten out significantly, but 200 is pretty good IMHO. Those first 200 yds are where drag forces are the highest and the BC during this period has cumulative effects (even at 1000+ the flight of the bullet has still been significantly affected by its BC during the first 200 yds). In any case, virtually all of Sierra's published BC's are average BC's from measuring over the first 150 yds. It's just pretty impractical to measure them at really long ranges, even with an underground range. [/QUOTE]
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Ballistic coeficient question with data
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