If I had twenty bullets, I could positively tell you what the BC is. At 3100-3300 fps, the 210 Bergers I just tested were .630 - .640 BC at standard sea level conditions. That's quite close to what Berger advertises. I wish all mfg's took the time to nail down the BC like this before they tried to sell bullets with inflated guesstimate numbers. Either Barnes Testing procedure is seriously flawed, the distances between their chronographs is inaccurate or they just guess at the BC based on some inaccurate method, because all but one bullet I've tested has seriously inflated BC's, period. In the end, it doesn't speak well of anyone who is that far off the mark, especially when it appears that it's done to promote a product, it's usually called false advertising.
Don, if you're using two Chronies and the BC is that high, how far apart are they placed, and at what distance from the muzzle is each one?
We use a standard model, dual chrony and reverse engineering to establish the BC of our bullets.
Standard model Chrony brand chrono?
Dual chrony?
Reverse engenering???
How you're getting the super high BC still eludes me, I'm still not sure, but I'd lay money on it being at least .150 higher than it really is. Have you got a picture of this bullet, and its length?
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I use two 4' rails, the first one hooked to the Oehler M43 and set at 10' from the muzzle, the other rail set at 300 yards (measured center screen to center screen) hooked to the M43 too, or the Oehler 35P.
300 yards is the "minimum" distance between them that ever I use for measuring BC's accurately.
