Ive personally owned Broughton 5C 1/11 and Bartlein 5R 1/11 barrels in 308, both shot less than .300 groups at 100 yds, but dont limit yourself to the brands i have mentioned.
We use Shilen barrels on our builds unless the client specifies otherwise. 1-10 twist can handle up to a 210 gr bullet with no problem. Usually the 175 gr. Sierra Matchking or the Hornady 178 gr AMAX work very well and can stay supersonic beyond 1000 yds with as little as a 22" barrel.
I use a Krieger 1-12" with really good resuls. I wanted to be able to shoot the 155's, 168's and the 175's. I believe the 1-12" can handle up to a 190 gr bullet.