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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Berger .338 300 grain EH - ballistic coefficient
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<blockquote data-quote="DocUSMCRetired" data-source="post: 1171997" data-attributes="member: 85458"><p>We know the BCs are accurate, we just updated them. So I have some questions/suggestions:</p><p></p><p>1. Did you check the MV right before you shot? As you were shooting? Or on another day?</p><p></p><p>2. What is your barrel twist? We have a calculator that can tell you the decreased BC due to non optimized twist rates and your current location: <a href="http://www.abmediaresources.com/ABToolbox.htm" target="_blank">www.abmediaresources.com/ABToolbox.htm</a></p><p></p><p>3. As mentioned before, have you done a Tall Target Test? The before mentioned Toolbox app actually has the math for the Tall Target Test in it, however here is the worksheet on that: <a href="http://www.abmediaresources.com/talltarget.pdf" target="_blank">http://www.abmediaresources.com/talltarget.pdf</a> </p><p></p><p>4. What did you use to determine your dope? Did you account for the Vertical aspect of both Coriolis and Aerodynamic Jump?</p><p></p><p>5. Make sure you measure bore height at the turrets to be the most accurate. </p><p></p><p>6. If you have a moment, please read this article: <a href="http://www.abmediaresources.com/BallisticCalibration.pdf" target="_blank">http://www.abmediaresources.com/BallisticCalibration.pdf</a> </p><p></p><p>7. Are you pointing your bullets? If so please read this: <a href="http://www.abmediaresources.com/BulletPointing.pdf" target="_blank">http://www.abmediaresources.com/BulletPointing.pdf</a> </p><p></p><p>We just updated those BCs so we know they are good, something else is going on here.</p></blockquote><p></p>
[QUOTE="DocUSMCRetired, post: 1171997, member: 85458"] We know the BCs are accurate, we just updated them. So I have some questions/suggestions: 1. Did you check the MV right before you shot? As you were shooting? Or on another day? 2. What is your barrel twist? We have a calculator that can tell you the decreased BC due to non optimized twist rates and your current location: [url]www.abmediaresources.com/ABToolbox.htm[/url] 3. As mentioned before, have you done a Tall Target Test? The before mentioned Toolbox app actually has the math for the Tall Target Test in it, however here is the worksheet on that: [url]http://www.abmediaresources.com/talltarget.pdf[/url] 4. What did you use to determine your dope? Did you account for the Vertical aspect of both Coriolis and Aerodynamic Jump? 5. Make sure you measure bore height at the turrets to be the most accurate. 6. If you have a moment, please read this article: [url]http://www.abmediaresources.com/BallisticCalibration.pdf[/url] 7. Are you pointing your bullets? If so please read this: [url]http://www.abmediaresources.com/BulletPointing.pdf[/url] We just updated those BCs so we know they are good, something else is going on here. [/QUOTE]
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Berger .338 300 grain EH - ballistic coefficient
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