This subject got tossed around pretty thoroughly a few weeks back. You might go into the archives and do a search. As a custom gunsmith, I use a lot of premium rifle barrels. All the preimum barrel makers recommend a break in. The most common procedure is to clean it every shot for the first ten rounds. A bullet with a long bearing surface is optimum, even if the twist in your rifle won't stabilize it.

By cleaning it, we mean one wet patch with Shooter's Choice - then ten strokes of a brass brush saturated with Shooter's Choice - then wet patches of Shooter's Choice until the patches come out clean - they a dry patch. Shoot another shot. Repeat.

After the first ten, you can go to cleaning every three or every 5 shots. At about the 50 round point, just clean and shoot as normal. Expect the barrel to be fully "broken in" at the 100 round point.