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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Let's argue about BC's
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<blockquote data-quote="BryanLitz" data-source="post: 480863" data-attributes="member: 7848"><p>I also cannot fathom how a meplat with the same outside diameter, but a larger opening would have more drag ??? unless the BC reduction is related to weight removal like groper suggested. I'm not saying the observations of increased drop are not accurate, but I would be very interested in learning more about what's going on there.</p><p></p><p>One thought might be that if the mass is not removed perfectly concentric from the hollow point, the resulting dynamic mass imbalance would cause the bullet to fly with a small amount of yaw, which would cause induced drag on the bullet (elevating it's drag above what it would be for a bullet flying with zero yaw).</p><p></p><p></p><p></p><p>The highlighted part of the above statement is key. Many people learn of the 15% meplat being 'optimal', and improperly assume that if they grind off the front of a needle sharp bullet to a meplat of 15%, it will be an improvement. This is not the case because in doing so, the nose length is <em>shortened</em>, so you're no longer comparing noses of the same length. Comparing a meplat of 0% to one of 15% for noses of the same length actually means two entirely different ogive shapes (one that comes to a point, and one that doesn't).</p><p></p><p>-Bryan</p></blockquote><p></p>
[QUOTE="BryanLitz, post: 480863, member: 7848"] I also cannot fathom how a meplat with the same outside diameter, but a larger opening would have more drag ??? unless the BC reduction is related to weight removal like groper suggested. I'm not saying the observations of increased drop are not accurate, but I would be very interested in learning more about what's going on there. One thought might be that if the mass is not removed perfectly concentric from the hollow point, the resulting dynamic mass imbalance would cause the bullet to fly with a small amount of yaw, which would cause induced drag on the bullet (elevating it's drag above what it would be for a bullet flying with zero yaw). The highlighted part of the above statement is key. Many people learn of the 15% meplat being 'optimal', and improperly assume that if they grind off the front of a needle sharp bullet to a meplat of 15%, it will be an improvement. This is not the case because in doing so, the nose length is [I]shortened[/I], so you're no longer comparing noses of the same length. Comparing a meplat of 0% to one of 15% for noses of the same length actually means two entirely different ogive shapes (one that comes to a point, and one that doesn't). -Bryan [/QUOTE]
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Let's argue about BC's
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