What is the rest of your reloading setup just because you are getting runout don't blame the S die it could be any of the tools in the process that is the problem, start with new brass measure it for uniformity including neck thickness even Lapua brass is not always to spec I have had to turn .004" off one batch to get it uniform, check that the the ram in the press is true and the shell holder is square with the bottom of the die,
It could also be the seating die if the seating stem is not quite straight or does not fit the bullets ogive,
To get the best out of reloading invest in a brenchrest type setup with Wilson straight line dies and an Arbor press,
how much runout are you getting?
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