I mentioned in another thread that if my brass had poor (say .004") TIR before or after sizing with the Lee Collet, that repeatedly bringing the brass back into the die while rotating the shell (AND holder) 360 degrees in small increments brought the TIR of the brass down to an acceptable level (.002" or less).
An update on that method: I found recently that just rotating the shell and holder ONCE, 180 degrees, was the superior method (most people recommend this). Neither method worked every time though.
Also, I found that if I backed the cap of the die out, and brought the brass back into the die repeatedly while screwing the cap to home, that this was more effective for reducing brass TIR. May be the same thing as backing the whole die out….
It needs to be known that this worked for me with quality brass (Nosler) having low neck wall thickness variation (0.001 – 0.0015â€Â).
I’m sure that this is tough on the brass too, since it is being worked more...