Can't close gap on full-length resizing die?

[AJC1]

Uuuuuh.... No.

In general, Sizing dies return the case to SAAMI minimums upon Full Length resizing.
Sizing dies do that upon the Shell-holder making firm contact with the die mouth -- i.e., Full-Length Resizing
Having the shell-holder in "firmer" contact with the die mouth does nothing other than "cam-over" the Press. It does not size further.

The OP is shooting a Gas Gun (AR)
Cases for Gas Guns should be Full-Length Resized every time unless the operator is well & truly into the details/measurements/has pulled the bolt apart/established case dimension minimums/and using a real comparator to set the press every time
Even then -- case condition/lube can cause slight variations.

BOTTOM LINE:
- OP should Full Length Resize (Shell-holder in firm Contact/slight Cam-Over)
- And think about throwing them away after 6-8 reloads

1. There is zero question full length resize is required and desired.
2. Dies have the capacity to oversize a case and I have one in 308 that will go sami minus .012. Is that a die problem or an incompetent operator issue.

 

[MEHavey]

That (may) be a comparator artifact.
Run your measurement/same instrument on factory 308 (usually close to SAAMI min) and compare the numbers,

 

[JFrank]

I only know what I’ve experienced with the dies I’ve personally owned or used.
I currently have one die with .022 of Edit: cam over/linkage movement beyond touch Edit: to accomplish sizing.. (too much cam over I’ll be putting this one in a lathe)
I’ve another with .004 gap between the shell holder and the base of the die and yet another set at .007 between the shell holder and the base of the die to accomplish correct sizing so imo a blanket statement to set a die at 1/4 turn past touch leaves plenty of room for discussion.

 

[MEHavey]

The 1/4-turn (Lee's Instruction) got my attention too.
I ASSumed it is due to Lee's greater "spring"

(I've always used Lyman/RCBS to ensure BombShelter stiffness - so whatever cams-ever-so-slightly is my standard for FLrS)