Receiver work 101:
First, accurizing, blueprinting, truing, tuning...they all are a layman's term to describe the same principle work.
What does it do? The intent is to make all of the critical features round, square, parallel, concentric, and free of taper from one another.
With that, does it improve the end result of smaller, tighter clusters of hole poked into paper, steel, and critters? Yes, but the gains are small.
A way to look upon this:
If you go Pro Stock drag racing, you better have 1250hp at the flywheel or its not even worth pulling the rig from your shop. That's what it takes to make a final. Spend a pile of cash in R/D and you might find 10-15 more hp than the rest of the field.
The important thing here is you had 1250 to start. With a bolt action rifle you get that with a premium grade barrel installed by someone who understands accurate gunmaking. The "other stuff" is the 10-15hp. By itself it means almost nothing. When added, the results can be truly impressive.
Notes from this:
To accurize an action properly it will involve barrel work as a consequence. Stabbing the old stick back onto the receiver with the old threads is dangerous. Don't do it. This process is a one way trip. You cannot put material back on. Retain a shop experienced in doing this kind of work as it's not trivial. Let the new guys obtain their training on someone else's property.
Primary Extraction work is almost always overlooked/ignored. It shouldn't be. This forensic machine work were doing has cascading effects that should be addressed. X1000 if you are working with an RR prefix Remington action as they are "fecked" from the factory before anyone ever touches it.
PE is directly related to how you as a shooter interface with the gun. Proper PE means the case comes out. You aren't banging on bolt handles after every shot. Ignore this and you spend more time cursing the gun than you do focussing on shooting. Never a good outcome.
Hope this helps.
C.