I know all that.
What I'm saying is that the "contact and quarter turn" recommended by the manufacturer of the die moved the shoulder back too far. What I simply did after that was use a comparator to measure shoulder set back, giving it about .002" room instead of a quarter-mile. That greatly extended the life. I know the chamber is in spec, I cut it and headspace gauges confirm it. The people who made the dies gave bad information.
When you fire about 2000 rounds a year, you'd like your brass to last, especially .30-06, it's not surplus any more.
I had been doing that for my ARs, both precision and the ones with 5.56 chambers, and the majority of the brass I use in these rifles is Lake City once-fired brass which is of military origin.
My press will cam over, and in no instance have I ever had to go a quarter turn to get the .002" I want, more like just past contact.
The exception may be my .45-70.....
