All of my action work is done in a True-Bore-Alignment System. I feel this is the most secure and stress free way to dial an action in. All of my action work is dialed within .0001 at two points using a ground mandrel the bolt raceway. The action face is squared, the lug abutments are cut true and the threads are cut square to the bolt raceway. The bolt nose, lugs and bolt face are also cut true for a perfect fit with 100% lug contact.