What does Weatherby® recommend as a break in procedure?
TWO BOX BARREL BREAK-IN
This barrel break-in procedure requires two boxes of ammunition to complete. Start out by shooting one round at a time, cleaning the barrel thoroughly after each round and allowing it to cool. This process should be followed for a total of ten rounds.
Then take the remaining thirty rounds and shoot ten three shot groups, cleaning the barrel thoroughly after each group and allowing it to cool completely before firing the next group. Once ten, three shot groups have been fired the barrel is adequately broken in. At this point the rifle can be sighted in and used.