"The AB numbers are not predictions. Bryan actually live-fires the bullets and measures drag by using Doppler radar. "
Now that I think about it this may be right other than I am not sure about the doppler part.
Notice how the chart says "advertised vs. tested". What that refers to is the fact that Bryan actually tests the bullets to measure their BC values, rather than just calculating the values based on computer models and simulations, like some manufacturers do. I believe Bryan said a few years ago that he used Doppler radar, but it's possible he just used multiple high-end chronographs to do his testing. I'll have to dig into it, but either way, he used robust testing methods.
