Double sleeve bolt body & bore action raceway.
 
Double sleeve bolt body & bore action raceway. This prevents the bolt from canting in the raceway, which tips the top bolt lug off the action lug. No matter how straight the action is the top lug never touches. The problems associated with this are explained in the book "Rifle Accuracy Fact"

Greg will do this only if he is doing the action work and at the same time of the action work, not later on.