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I have by FL dies just touching shell holder maybe a tad higher (1/8 turn out).
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I have no clue what a 'tad' is but a 1/4 turn is .0178", I have one rifle that requires a .014" gap between the top of the shell holder and bottom of the die. I have an M1917 Eddystoner with a chamber that is .002" longer than a field reject chamber from the shoulder to the bolt face, that chamber is .016" longer than a minimum length sized/new unfired factory round from the shoulder of the case to the case head.
Problem, no one knows what a minimum length/full length sized case is.
To test the length of the chamber I used trashy old cases fired in trashy old chambers, problem, none of the cases were fired in a chamber as trashy as the one in my M1917 Eddystone.
What did I do? The next best thing, I started forming 30/06 cases from 280 Remington cases, how could I miss, the 280 Remington case is ahead of the 30/06 shoulder by .051", can't miss, correction, I can not miss.
I adjusted the die off the shell holder .010" then sized a case, it chambered, . I added 005"" to the gap to increase the length of the case. It chambered, then I added .001" to the gap to make it . The bolt closed with a slight felt resistance.
The .010" is the equivalent of a no go-gage plus .001", the .016" is the equivalent of a field reject length chamber + .002".
F. Guffey