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I get the least amount of seating variation when I have the resizing die set for firm (not crushing) contact with the shell plate. Double-check for light passing between the shell plate and the die when all four stations are "occupied." If it's still contacting with stress from those four stations, your linkage and toolhead slop will be eliminated from the mix.
Then the variations will come from variations in bullet nose, gunk (if any) in the seating plug, and whether there's a granule of powder underneath the case. Maybe differences in neck tension between cases will have some effect too...
HTH.
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