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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Can you trust advertised ballistics coefficients? Mostly...but not always...
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<blockquote data-quote="Doom2" data-source="post: 2872828" data-attributes="member: 108323"><p>Ballistic coefficient is a factor that is used to estimate the coefficient of drag as compared to a specific bullet shape. The coefficient of drag is a function of velocity/Mach Number. Since most bullets do not conform to the specific drag models so they do not behave over a large range of velocities as the models so the BC ends up being a function of velocity (see Brian Ritz and custom drag models). Since most published numbers are quoted without any reference to velocity it must be treated with some degree of skepticism since we don't know the velocity range over which the BC was determined. </p><p></p><p>Hornady has refined their BC for the ELD's and Sierra publishes a velocity range for all of their BC's. Unfortunately, bullets are a commodity and marketing is marketing. The better the seller can make his product look the better. That often comes at the expense of the whole truth.</p></blockquote><p></p>
[QUOTE="Doom2, post: 2872828, member: 108323"] Ballistic coefficient is a factor that is used to estimate the coefficient of drag as compared to a specific bullet shape. The coefficient of drag is a function of velocity/Mach Number. Since most bullets do not conform to the specific drag models so they do not behave over a large range of velocities as the models so the BC ends up being a function of velocity (see Brian Ritz and custom drag models). Since most published numbers are quoted without any reference to velocity it must be treated with some degree of skepticism since we don't know the velocity range over which the BC was determined. Hornady has refined their BC for the ELD's and Sierra publishes a velocity range for all of their BC's. Unfortunately, bullets are a commodity and marketing is marketing. The better the seller can make his product look the better. That often comes at the expense of the whole truth. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Can you trust advertised ballistics coefficients? Mostly...but not always...
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