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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet BC
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<blockquote data-quote="Kevin Thomas" data-source="post: 273120" data-attributes="member: 15748"><p>Hey Zach,</p><p></p><p>Easiest thing I can recommend for you here is to pick up a copy of "Hatcher's Notebook" from Stackpole press. There are a complete set of drag tables, along with several examples of how they're used. You still need to know velocity at two different points, and that's absolutely required to calculate a BC. The tables in the book are Ingalls', which can be used almost interchangeably with the G1 currently in use for US sporting bullets and ammunition. There's also an abbreviated copy of the Coxe-Bugless charts for estimating ogive values and ballistic coefficients by this shape. Not very precise, but an interesting history lesson today. It's worth picking up a copy of Hatcher's Notebook anyway, and every serious shooter should have a copy on his bench. </p><p></p><p>If you really want to get serious here, there's "Modern Exterior Ballistics" by the late Bob McCoy. It's available from Schiffer publishing, but it's a bit steep at close to $100 a copy. It will still require the same basic info here; known velocities from two different points downrange. Anything beyond this, such as methods based on shape, basically comes down to an "educated guesstimate." </p><p></p><p>Hope this helps,</p><p></p><p>Kevin Thomas</p><p>Berer Bullets</p></blockquote><p></p>
[QUOTE="Kevin Thomas, post: 273120, member: 15748"] Hey Zach, Easiest thing I can recommend for you here is to pick up a copy of "Hatcher's Notebook" from Stackpole press. There are a complete set of drag tables, along with several examples of how they're used. You still need to know velocity at two different points, and that's absolutely required to calculate a BC. The tables in the book are Ingalls', which can be used almost interchangeably with the G1 currently in use for US sporting bullets and ammunition. There's also an abbreviated copy of the Coxe-Bugless charts for estimating ogive values and ballistic coefficients by this shape. Not very precise, but an interesting history lesson today. It's worth picking up a copy of Hatcher's Notebook anyway, and every serious shooter should have a copy on his bench. If you really want to get serious here, there's "Modern Exterior Ballistics" by the late Bob McCoy. It's available from Schiffer publishing, but it's a bit steep at close to $100 a copy. It will still require the same basic info here; known velocities from two different points downrange. Anything beyond this, such as methods based on shape, basically comes down to an "educated guesstimate." Hope this helps, Kevin Thomas Berer Bullets [/QUOTE]
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