Re: Action Truing
Go to Gre-Tan's website, he has some info and some good instructional videos.
Briefly, he reams the bolt raceway to a consistent diameter (0.705, IIRC), refaces the face of the action true to the freshly reamed boltway, recuts the threads with a single point tool to get them true. Recuts the surfaces the bolt lugs bear on.
Some folks will "true" an action differently using a tap to clean up the threads, but after watching Greg Tannel's method and various other methods on videos rented from Smartflix, I'll say I prefer the Gre-Tan way.
Not a gunsmith, just a crackpot with a lathe.