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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Hammer ballistic coefficients
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<blockquote data-quote="7070yshot" data-source="post: 2238636" data-attributes="member: 114427"><p>They either use a mathematical guess or have bullets shot and measured with a Doppler radar like what applied ballistics lab uses. These are 100kplus$ machines. </p><p>also you are given an average and for 600y shot and under it will very close. After that things can fall off IMO and certainly ones the bullet hits 1250fps (transonic) the BC changes then again at 1100-1050.</p><p></p><p>Even the AB Labs Doppler system only goes out to 2000y from there data is extrapolated (mathematical guess)</p><p></p><p>my advice is use the box BC or Your App bullet library. Adjust velocity to match actual come up in MOA/Mils out to 600-900. Then have a second table or do a BC calibration for wherever you hit transonic. Meaning if BC is .425 but you hit 2MOA low at 1000y adjust BC until the come up matches impact</p></blockquote><p></p>
[QUOTE="7070yshot, post: 2238636, member: 114427"] They either use a mathematical guess or have bullets shot and measured with a Doppler radar like what applied ballistics lab uses. These are 100kplus$ machines. also you are given an average and for 600y shot and under it will very close. After that things can fall off IMO and certainly ones the bullet hits 1250fps (transonic) the BC changes then again at 1100-1050. Even the AB Labs Doppler system only goes out to 2000y from there data is extrapolated (mathematical guess) my advice is use the box BC or Your App bullet library. Adjust velocity to match actual come up in MOA/Mils out to 600-900. Then have a second table or do a BC calibration for wherever you hit transonic. Meaning if BC is .425 but you hit 2MOA low at 1000y adjust BC until the come up matches impact [/QUOTE]
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Hammer ballistic coefficients
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