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Did the shot hit low or anything? It's possible that it's not exactly the bullet's fault, rather the cartridge was mischarged/undercharged, and the bullet possibly left the barrel at a significantly slower velocity than it should have. The bullet pictured looks a lot like what a bullet that was designed for 1800-3000fps impact velocities, but ended up hitting at 1500-1600.
Even if the bullet was manufactured faulty, I would think that a bullet with exposed lead at the tip, would open up a bit more than that at velocities over 2000fps.
Also I will agree that a BC of .414 for that bullet seems a bit optimistic but it's also important to remember that G1 BC is not constant. It changes at different velocities. The bullet may have a higher BC at .300win mag velocities, while at .308 velocities it could be lower, or visa versa. Depending on the velocity they tested at, it could skew the numbers a bit.
Just my $.02
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