In my limited experience,if the rifle easily chambers and extracts/ejects rounds normally without issues or damage to the cartridge(i.e. change to COL,leade marking bullet ogive,deformed cartridge shoulder etc.).I call it good to go.
As Bill Alexander detailed expertly in that post I linked,the barrel/bolt combo's Ive had that wouldn't close on a GO,but will chamber rounds without issue, all settle in after a few hundred rounds to near match quality in regards to headspace.I actually prefer a combo a bit on the tight side right out of the box.
That said,if there is doubt always investigate for other issues such as short leade/throat,but if none are found, I'd bet the parts wear into near perfect headspace in regards to the GO gauge.
If it bothers you,and the parts are in spec and no defects,swap bolts around until you get a good match on the GO.
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