I have been using both G7 and G1. They all come up with the same numbers out to 2000 meters. I use Applied Ballistics App for Android, and have downloaded custom drag curves. When using G7 or G1, I allways hit 3-4 moa high at 2000 meters, but when using Custom I am more or less spot on. The G7-G1 is pretty correct out to 12-1300 meters wit my setup, but after that, it is not accurate.
Custom dragcurves is the way to go