Several things to consider when "truing" up a Savage action. If you simply chuck the action in a lathe, you are indexing off the outer circumference of the action. The actual tenon thread may or may not be co-axial with the outer surface. So if you true up the action face to the outside, it may not be perpendicular to the threads. IOW, a wasted effort unless you develop the tooling to index off the threads, not hard to do just required time and effort. Then there's the variation in thread pitch/dia to contend with. So how close is close enough?
All the Savage model 12 actions I have were knurled around the action face, which produced a slight burr on the outer diameter of the face. This is easily seen once you've removed the barrel and lug. I assume this was a work hardening effort. But I've had a model 12FV where the recoil lug was offset from the face due to that burr, and subsequent removal of the barrel showed a irregular wear on the barrel nut and forward face of the recoil lug.
So I'm in the same camp as Robinhood and hone the burr off the face. I don't have a precision flat plate, so I use a very flat sheet of glass and 800 grit wet/dry (I bought from Scary sharp supplies
https://taytools.com/collections/sup...y-sharp-system) and lapping in figure 8's.
Subsequent torque up shows a perfectly flat mating surface, and I always buy a new precision ground nut and recoil lug from NSS.
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