A couple years ago I would have completely agreed with you but a 215 Berger in a 308 set up properly is quite frankly amazing, I'm beating the 168 Berger on windage to the tune of 2 MOA at 1000 yards, I'm running right with where I end up with a 6.5x284 with 140 Bergers.
Don't think about the weight look at the BC, I'm pushing the 215 with extreme accuracy out to 1535 yards and I'm not going sub sonic for another 100ish yards, THAT is what excites me about a 308!
Rhian, you and Montanamarine have convinced me to give the venerable .308 Win another look.