6.5 Grendel PTG Reamer

[dmsims21]

with the shallow angle, -.001 could make a difference.

The reamer may be correct, but the barrels may be machined too economically.
I wonder about the liberty barrel making process. Do they drill, ream, then button the bore? Do they skip the reaming process? Do they machine too quickly to get a good surface finish? Are the barrels not centered on the lathe well? Does the chamber reamer chatter? Do they rough ream, and then finish ream the chamber, or just ream the chamber in one step?

All of those questions could answer why an in spec reamer would not create an in spec part.