I was looking at this subject myself a few days ago and one guy on YT made a really simple observation. If a seating die has 28 threads per inch, and you do some basic maths it means that one full turn of the die means that the seating depth changes by 35.7 thousandths of an inch. Half a turn then is 17.8 thou. a quarter turn is half that, and so on. Someone with a 3D printer could print a dial to fit over the top of the unit with segments marked off.
Here is a link that is worth a look, he is a little long winded but interesting none the less.
https://www.youtube.com/watch?v=DTPECIm4CGM&t=1397s
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