For my precision bolt guns, it's more of a feel when seating. I don't neck turn (I don't believe in doing it). I do anneal every firing though. Consistency is what I seek. Neck sizing shoulder bump dies do the trick for all (except the BMG) rounds. Smooth as butter is what I seek. (And yes, they are firmly held by the neck.)
You certainly can tell the difference between virgin and fired brass when you seat.
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