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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
9 o'clock vs. 3 o'clock wind drifts different with same wind velocity???
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<blockquote data-quote="Topshot" data-source="post: 615167" data-attributes="member: 13285"><p>Paphil,</p><p>To work it out I would need to know the length of your bullet, the twist rate of your barrel, bullet weight, B.C. and your velocity to give you a figure.</p><p>Spin drift is a function of the above as well as time of flight and departure angle.</p><p>There are a few ways that spin drift is calculated on hand held phones and PDA's. One way is as a fraction of the standard US mil ball tables, another is by approximation calculations that simplify a lot of more complex models (As per "Shooter)". A third way is how Exbal does it by user input data from test shots but this gives a linear result as I understand it.</p><p>Its handy to know which way your program works for ELR shooting but not real important for out to 1K.</p><p>It can be measured with doplar radar.</p></blockquote><p></p>
[QUOTE="Topshot, post: 615167, member: 13285"] Paphil, To work it out I would need to know the length of your bullet, the twist rate of your barrel, bullet weight, B.C. and your velocity to give you a figure. Spin drift is a function of the above as well as time of flight and departure angle. There are a few ways that spin drift is calculated on hand held phones and PDA's. One way is as a fraction of the standard US mil ball tables, another is by approximation calculations that simplify a lot of more complex models (As per "Shooter)". A third way is how Exbal does it by user input data from test shots but this gives a linear result as I understand it. Its handy to know which way your program works for ELR shooting but not real important for out to 1K. It can be measured with doplar radar. [/QUOTE]
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9 o'clock vs. 3 o'clock wind drifts different with same wind velocity???
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