Just a quick note...Once upon a time I relied on these ballistic calculators to predict a flight path for a particular load for varminting with a .220 Swift. I assumed that it would be accurate enough, and didn't bother putting the loads on paper at ranges other than the (2" high at) 100 yard zero that I prefer. Even though I was quite comprehensive in inputting the load data, the calculator showed a bullet drop far in excess of what was actually happening, and I shot over the backs of a lot of jackrabbits that day, out past 300 yards. My point being, there is no substitute for empirical data.
I don't know about online data, but several of my load manuals have ballistic charts, as well as ammo manufacturers' free brochures.
Smith is right. I've seen a case where two bullets of different make were hitting the same place at 100 yards but were 8" apart at 300 yards. The groups were shot at the same time. The manufacturer's data predicted a 2" difference. To put it politely, some manufacturer's ballistic coefficients are hopelessly optimistic. On the other hand, the numbers are adjusted to sea level and 59°F / 15°C. Shooting on a hot day on the high plains changes things.
Robert Sherwood had an article in Handloaders Digest titled "Shoot Them and See". Good advice.
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