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Rifles, Reloading, Optics, Equipment
Reloading
Spreadsheet for reloading
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<blockquote data-quote="Hugnot" data-source="post: 2290263" data-attributes="member: 115658"><p>Sectional Density (SD) combined with G7 ballistic coefficient (BC) provides some indication of bullet drag or Form Factor (FF)</p><p></p><p>BC = SD/FF and FF = SD/BC</p><p></p><p>[URL unfurl="true"]https://bergerbullets.com/form-factors-a-useful-analysis-tool/[/URL]</p><p></p><p>[ATTACH]298869[/ATTACH]</p><p></p><p>The spread sheet shown above shows SD, BC & FF values. I see that the ELDM bullets that replaced the AMax bullets have improved BC values. What the Berger link is saying is that if the BC of a certain bullet is in part weight dependent, a bullet with the same BC but weighing less can be driven faster and be a better flight performer.</p><p></p><p>The spread sheet calculates SD & FF from established diameter, weight, & BC values. The new .224 75 gr. ELDM driven at 3250 from a quick twist .22-.250 and having a sub 1.0 FF makes for a first rate long range yote & rodent bullet considering ballistics, recoil, economy (bullet cost & light powder charges), and terminal performance - swats down all rodents real good and expands well on yotes but not for pelt collection. </p><p></p><p>SD is a real consideration in both flight & terminal performance.</p></blockquote><p></p>
[QUOTE="Hugnot, post: 2290263, member: 115658"] Sectional Density (SD) combined with G7 ballistic coefficient (BC) provides some indication of bullet drag or Form Factor (FF) BC = SD/FF and FF = SD/BC [URL unfurl="true"]https://bergerbullets.com/form-factors-a-useful-analysis-tool/[/URL] [ATTACH]298869[/ATTACH] The spread sheet shown above shows SD, BC & FF values. I see that the ELDM bullets that replaced the AMax bullets have improved BC values. What the Berger link is saying is that if the BC of a certain bullet is in part weight dependent, a bullet with the same BC but weighing less can be driven faster and be a better flight performer. The spread sheet calculates SD & FF from established diameter, weight, & BC values. The new .224 75 gr. ELDM driven at 3250 from a quick twist .22-.250 and having a sub 1.0 FF makes for a first rate long range yote & rodent bullet considering ballistics, recoil, economy (bullet cost & light powder charges), and terminal performance - swats down all rodents real good and expands well on yotes but not for pelt collection. SD is a real consideration in both flight & terminal performance. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Spreadsheet for reloading
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