Bullet manufacturers have been using bc as a selling tool. G1 bc looks much better as it is a bigger number. Then if a company inflates 10% on the G1 it looks even better. Most purchasers of bullets have no idea what to do with a bc, so it makes no difference to them, but they bought the product. Very few shooters will ever shoot past 300y let alone 500y. They can't tell the diff in the bc. Hats off to Berger for getting it as accurate as possible.
From my point of view, bc is a varying value determined by the combination of rifle and bullet. The bc value will be affected in different ways by different rifles. If a shooter is really ringing out his equipment he may have to make an adjustment to the given bc value in order to get things to line up. I look at bc as a fluid number that I use with all the data collected from shooting at multiple yardages, and then use to get my drops to work out.
The G7 value works out better than the G1 value, and once the G7 value is accurate for the given equipment set up, it will line up much farther out with less tweaking to the data.
We decided that we would market our bullets with G7 values for the same reason that Berger is using it. It's better. Most modern bullets are better served with the G7 rather than the G1. The only good reason to use the G1, as a manufacturer, is to try and falsely look better than you are in order to boost sales.
No smoke and mirrors here. Berger is trying to help you shoot better.
Steve