So on the screen where you set up your bullet profile for the rifle you are going to shoot it in. It asks for g1 or g7. There is also a place where there is a number for the bc. In my case for a 180 grain nosler AB I have been using the g1 bc of .507. I don't know what the g7 bc would be. But I'm pretty sure it would be quite a bit lower probably some place around .260. So if I don't know the g7 bc and tell the shooter app to use the g7 and and leave the .507 installed it will show a significantly lower moa adjustment. It's my understanding that the g7 bc is the better of the profiles to use. But the number put into the shooter ap has to be correct and unless I'm wrong the g7 number is going to be significantly less than the g1. Hope that helps???????????????