Rifle magazine (or was it Rifle Shooter)... ? ... a few years back did a barrel life test on an HS Precision .308 win.
edit... here's a link discussing the test: http://www.longrangehunting.com/foru...regulars-8770/
It began the test averaging 1/2 MOA with various types of 168 grain match ammo... and after 10,000 rounds (ten THOUSAND)... it was still shooting well under 3/4 MOA.
So it's not likely you've gotten close to wearing out that barrel...
One of the things I really love about the .308 (over the necked down various barrel burners) is barrel life. Add to that the forgiving nature of the .308 win cartridge where reloading is concerned, great inherent accuracy... and it'll remain my top choice for years to come, I'm sure.