Good question as I have about 200 pieces of new 30-06 Rem brass that I am going to reload
in the very near future. I was going to check the brass with my calipers and case gauge
before I make the sizing decision. If it didn't smell right I was going to size and trim.
With rifle brass, I would at the least check that they are all sized correctly (With an RCBS Mic or some such gage), and then I would neck size them to iron out any dents.