QUOTE(TigerStripe @ March 12th 2008 3:55 PM)

You could carry a lot more 6.8 than .308 and it's much more powerful than 5.56...
TS
I think that's the major advantage. The 308's performance will be light years better at long range, but if I was shooting at short to moderate range and didn't need the 308's punch, I'd happily trade a lot of weight for a little bit of energy. At a sane range the only real disadvantage is not being able to go to a local fun shop and grab a box of ammo if you leave your special recipe at home.
Question is...why SPC and not Grendel? *furiously stirs pot*