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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Ballistic programs that dont agree
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<blockquote data-quote="BallisticsGuy" data-source="post: 1721492" data-attributes="member: 96226"><p>For G1 calculations one has to understand that a G1 BC is really just a comparison to a reference projectile which has very well documented and known performance. Some poor schmucks had to go out and shoot huge numbers of rounds of reference projectiles in various conditions and come out with tables of results. Because of that a G1 BC being used on a non-G1 compliant projectile is really only valid to whatever distance it's meant to be valid to and outside of that it becomes rapidly less accurate. This is where BC "truing" (a tragically inaccurate term in this case) comes in and why it sucks. There are also methods to deal with this problem that involve BC banding and BC sloping which have the benefit of being more accurate but also more of a PITA for the layman. </p><p></p><p>FWIW, I would be very keen to find out how the math actually got implemented for 4DOF but I suspect that it comes down to is the same basic math we're familiar with but with custom drag tables created from a large amount of data gathering involving doppler radar.</p></blockquote><p></p>
[QUOTE="BallisticsGuy, post: 1721492, member: 96226"] For G1 calculations one has to understand that a G1 BC is really just a comparison to a reference projectile which has very well documented and known performance. Some poor schmucks had to go out and shoot huge numbers of rounds of reference projectiles in various conditions and come out with tables of results. Because of that a G1 BC being used on a non-G1 compliant projectile is really only valid to whatever distance it's meant to be valid to and outside of that it becomes rapidly less accurate. This is where BC "truing" (a tragically inaccurate term in this case) comes in and why it sucks. There are also methods to deal with this problem that involve BC banding and BC sloping which have the benefit of being more accurate but also more of a PITA for the layman. FWIW, I would be very keen to find out how the math actually got implemented for 4DOF but I suspect that it comes down to is the same basic math we're familiar with but with custom drag tables created from a large amount of data gathering involving doppler radar. [/QUOTE]
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Rifles, Bullets, Barrels & Ballistics
Ballistic programs that dont agree
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