With the obvious differences of the complicated/expensive to produce cartridge case and 30+% higher chamber pressure, what real difference is there between the 6.8x51mm new cartridge and the .270x51 wildcat, better known as .270-308! Performance wise how will it differ from the .270 Winchester?

Now we will have .243/6mm-'08, 6.5-'08, .25-'08, .270-'08, and now what sounds like really a 6.8-'08. WHY??

__________________
Gunsmithing since 1961