FWIW, I've talked w/ some of those same folks that PKunda is referring to. 2700-2750 is reasonably doable, 2800+ can be had... 2900 is the upper limit from what I've heard and may not be doable from every rifle regardless what magical blend of powder & barrel you have. Commonwealth (Brits, Aussies, New Zealander, etc.) 'match rifle' shooters fire out to 1200yds w/ some rather stout loads using 190-210s out of a .308, and have been doing so long before F-Class was even thought of.
The catch is... I kind of got the impression that brass life was pretty much nil... couple firings at most. Barrel life takes a downward turn as well (push the bullet at .300WM velocities... guess what, you get .300 WM barrel life, plus or minus).
It's an interesting concept... I've got a few boxes of 190-210
kicking around here. The big question is whether I have a long enough throat in my 12 F/TR to make it worth while... somewhere in all my 'spare' time I'll have to give it a go. Then again, I've shot against some folks using those 'nuclear' loads... plain old 155 VLD @ 2950fps seemed to hold its own okay for me