Hammer1Down, blueprinting an action typically means making all its parts fit with near zero tolerances. It includes the following:
* Squaring the bolt and receiver faces up with the barrel tenon's thread axis.
* Lapping the bolt lugs to full 100% contact with their shoulders in the receiver.
The above are the three most important ones. Some believe the following have to be done, but others have proved it doesn't:
* Reaming the bolt way perfectly aligned with the receiver's axis relative to its outside shape, then sleeving the bolt for a tight fit to the receiver.
* Rethreading the barrel tenon threads to the same axis as the bolt.
* Fitting the cocking piece and firing pin so the pin's lug makes consistant contact with the trigger sear.
There may be others, but doing all of these can cost a few hundred dollars. Unless the barrel and its chamber are top quality, only the first three will show any significant improvement in accuracy. All the rest are more optional than mandatory, in my opinion. Actions with only those first three done ending up with sloppy bolt and firing pin fit to the receiver and trigger have shot just as accurate as those with full and total blueprinting after a good, repeatable trigger's been installed. I think a good trigger's much more important than all those things after the first three.
