To do a full and proper truing of the action, the front face is machined down a few thousandths of an inch while the action is supported with a precise mandrel through the bore of the action. While in this mandrel the threads are checked for concentricty to the bore of the action.

Is blueprinting an action worth it?

Blueprinting (also called trueing) can also be a cost-effective way to begin competing at precision long-range matches with a rifle you probably already have in your gun safe. For maximum accuracy, a barreled action should have a receiver with a bolt hole that is dead straight and centered in the receiver body.

How much does it cost to true a rem 700 action?

The actual cost of truing the Remington 700 action per Kevin Cram's price quote is $175 not $640. There are no free rides to accuracy.