1. Your action needs a good home to live in. If the stock you have is one of the cheap factory tupperware stocks, replace it with a quality stock like an HS Precision or Bell & Carlson. If the stock you choose does not have an aluminum bedding block, then have the stock pillar bedded and have it skim coated.
2. Recrown your barrel. This is one of the most overlooked accuracy enhancing tasks. The tip of many factory barrels are not square to the bore - resulting in poor accuracy.
3. Have your trigger tuned to 2.5 or 3lbs. In the alternative, consider replacing the trigger with a good aftermarket trigger.
4. Lap the lugs of your bolt. This will ensure 100% contact between your bolt lugs and the chamber.
I've written these in the order in which I would do the work if I were to do each job individually. Although many gunsmiths will do all of this at one time. A good stock will cost you 200 to 300 dollars. The gunsmith work can be done for 250 to 275 depending on your smith.
I talk the talk and walk the walk.... My 308 1k Rifle - The Evolution Continues!