There's no denying the .308 Win is a good hunting round, but it doesn't exist in a vacuum. There are other rounds (such as the 7-08, .30-06 and even the less powerful .300 Savage) that have some slight advantages in some areas but have disadvantages in other areas when compared to the .308 Win. By tweaking the .308 Win, you can attempt to erode or eliminate the advantages that other rounds have over the .308 in the areas that they have those advantages, whilst at the same time, keeping most of the advantages the .308 Win has over the other rounds. And the beauty of it is, those who want to stick to their current way of doing things with their .308 can...they don't have to change one bit!
If a guy is looking for more performance, going to a 7mm with its sleeker bullets makes more sense than fiddling with a 308. Also, pushing the shoulder forward to make a sort of Gibbs version of the 308 negates the use of factory ammo, which is one of the handier reasons to use a 308 to begin with. But oh well, to each his own.
