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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="groper" data-source="post: 480855" data-attributes="member: 12550"><p>Nope, youll get more disagreement from me on that note... the inside diameter of the meplat should have no bearing on supersonic aerodynamics The flow is choked off and behaves as a blunt flat tip. The resulting bow shock is detached from the nose of the projectile at this point, and it may reattach futher down the nose of the bullet if the meplat is very small, or simply remain detached if the meplat is large. </p><p>Your observations Topshot, must have been caused by something else - i wont speculate on what this might be, but for example did you measure the mass of the bullet after you modifications? Less mass = less BC all else equal...</p><p></p><p>Another interesting point on meplats, is if the meplat is 15% or less of the caliber diameter, it does not increase drag at all compared to a perfectly pointed tip. In fact, there is evidence to suggest 15% meplat diameter is ideal because it actually has slightly LESS drag than a perfectly pointed tip of the same nose length and caliber... Unfortunately, meplats are usually greater than 15%...</p></blockquote><p></p>
[QUOTE="groper, post: 480855, member: 12550"] Nope, youll get more disagreement from me on that note... the inside diameter of the meplat should have no bearing on supersonic aerodynamics The flow is choked off and behaves as a blunt flat tip. The resulting bow shock is detached from the nose of the projectile at this point, and it may reattach futher down the nose of the bullet if the meplat is very small, or simply remain detached if the meplat is large. Your observations Topshot, must have been caused by something else - i wont speculate on what this might be, but for example did you measure the mass of the bullet after you modifications? Less mass = less BC all else equal... Another interesting point on meplats, is if the meplat is 15% or less of the caliber diameter, it does not increase drag at all compared to a perfectly pointed tip. In fact, there is evidence to suggest 15% meplat diameter is ideal because it actually has slightly LESS drag than a perfectly pointed tip of the same nose length and caliber... Unfortunately, meplats are usually greater than 15%... [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Let's argue about BC's
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