I've always used a round in the chamber closing the bolt and tightening the barrel till i get slight tension on the bolt . do the factory stamps ever line up as they should on the left side or am i just setting it too tight ? its currently 1/4 turn backed off (stamp about 1 o'clock looking from the action forward) if i turn it til the stamp lines up the bolt will not close. if i loosened the barrel tip the stamp is correct again that would be a full turn loose. I've never had any problems with this way i guess its just a curiosity i have ?