If you use a bullet comparator, such as those from Sinclair International, you only need to measure it ONCE. Then you set your seating according to the measurement from the comparator.
Yes, you must reset the seating stem when you change bullets, but that's no problem when using the comparator.
The easiest way that I've found is to take an unprimed, resized case, and make a "dummy round" for each load, and use the dummy for die adjustments.
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