Savage LRP could fit the bill. Mine easily splits flower stalks at 100m with the 6.5 Creedmoor. I chose something besides .308 though. I like the 6.5 Creedmoor, and if you look at scoring results, unless it's a military caliber shoot, you won't see a 7.62 on there. 6mm, 6.5 and 7mm all day long. Savage makes the 12- F class rifle pretty much already set up... 2 1/4 groups at 400 yards with a 6.5x284.
I wouldn't say ammo selection is a limiting factor (but I reload) I can find 6.5 creedmoor here, but .308 anything goes really fast.
http://www.gunblast.com/Savage-12F.htm
I tried to dig up the score results that had the actions, barrels, stocks and calibers of the shooters and what they placed, but I couldn't dig it up again.
I'm not trying to knock a .308, I know it can be done and has been done...yada yada... I'm just saying there are some alternative/better choices out there.