M1Garand,
How old is that article? No doubt some of the BCs published by manufacturers are still inflated, but Berger has re-evaluated all of their published BCs over the past few years. Bryan Litz, who did BC testing for Berger, has also written a book in which he published field tested values for BCs for 236 long range bullets. My impression is that Litz's book covers the most popular target bullets (at least the long-range target bullets), so you don't have to just believe what manufacturers publish.
Based on what I've read, I would tend to trust the current BC values published by Berger. However, as I'm sure you know, BC varies some with velocity, so one value doesn't necessarily give you enough data, depending on the individual bullet.
