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Correction to Correction to ......

To altsniper and OF&B: Compared to all the references I have handy, the equation listed with the constant 7.3 e-5 is missing a factor of two. It is interesting that dropping the factor of two and using total flight time should give results very similar to using 2 * 7.3e-5 and the vacuum...

altsniper: OF&B has listed the correct formula, but I fear the issue of velocity may remain. For the vacuum trajectory the muzzle velocity is correct but the air through which the bullet moves has a local velocity, thus should effectively create a wind. The Didion model for wind drift...

Cross Wind Discussion Deflections and Drift of a Bullet in a Crosswind http://www.exteriorballistics.com/ebexplained/articles/article2.pdf

Formulas: No stinkin' calculus needed for Pejsa

Formulas JD: What bullets are you interested in, and what data do you have? Using velocity measurements on high power rifles, I have several formulas and spread sheets, but none online. For pistols, I don't know if the rifle formulas as written would work but math is easy to change if we...

K2 Are you still interested these many months later? Velocity profiles decouple the equations. AR P.S. I agree with your comment about McCoy's book

p_pops: "It's an analytical maturity to the industry that's progressing. Data->Information->Knowledge" I think W. E. Deming called this "profound knowledge". The next generation of devices is being constructed, and may already exist someplace. It will give both velocity and...

I should add that what has changed over years is that bullets today are mostly all stable for much of their trajectory and at high speed have a simple V(S) profile so it is possible to do the trajectory "bookkeeping" in a way that was not possible in and around Mach 1.

p_pops: If you are designing bullets or guns, you definitely need drag functions. If you are shooting, most all the information you need is what is on the back of the box these days along with a way to find your muzzle V. I don't see a way around some sort of calculator, but it doesn't have...

Pinecone: You have the basic idea. More accurately, drop is based on both time and drag; drop is less than1/2 GT^2 from the factor (V/Vz)^.3

p_pops -- Thanks for the note. I suspect that for every one who is motivated enough to actually do a post, there are dozens who are interested, so nothing gets "wasted".

While interest in this thread may have waned in the months gone by, I would like to note there is a two equation formula for drop posted on my web site, Trajectory Parameters - The Analytical Rifleist. It relies on the velocity parameters describing the bullet trajectory which can be acquired...

While the central purpose of external ballistics is to predict where the bullet is gong to land, the other purpose is to explain how bullets fly. Many people on shooting sites have requested simple explanations of how bullets fly, to be told it is way too complicated to explain easily. I beg to...

Whatever else, data is always interesting. Thank you for the post. Most everyone here knows that each bullet and barrel must have a separate powder adjustment to get max. velocity consistent with harmonic control. At theoretical optimum, the energy of the bullet, .5 m v^2 will go up...