Re: Burger Bullets BC?
Berger's BCs are very good, but there's no such thing as a truly "accurate" BC listed by any manufactor; it'll be different when you measure it yourself. The problem is, they change, depending on the environmental factors and the location. They provide a starting point, but actually (and acurately) reflect the results recorded when and where the bullets were tested, and corrected back to standard metro or ICAO conditions.
You might also consider that there's always some degree of variation in BC from one lot to the next, and minor changes that result from firings in different rifles, twist rates, etc.. Minor, but still measurable, and will play a part in the final results. On top of that, is the G1/G7 issue, especially with streamlined bullets like most of the Berger line. If you measure the bullet against the G1 standard, the farther apart your firing conditions are from those of the original testing, the further off your results will be. Shouldn't be as much of an issue with the G7, since it follows the model.
Bryan's around here fairly regularly, and he'll be able to provide you with a better explanation than I. After all, he's the one who did the firing tests, and I'm sure he'll share his insights with you.