25-06, factory sporter barrel and action (trophy hunter) with a NSS recoil lug.
I set the headspace and shot it several times with no issues, I rechecked it-go gage will close, field and no-go will not close.

Brass is used (I can't get any new right now).

FL sized, brass wouldn't let the bolt close. I did the sharpie trick on several pieces and adjusted my sizing die down, the brass I checked after moving my die down would chamber (some were easier to close the bolt than others).
-I resized my batch (about 100 pieces) and trimmed them all to 2.484 (lyman reloading manual spec).
-loaded 20 for some new testing, and most wouldn't let me close the bolt, others were tighter than I felt comfortable with. Now I have to pull them apart, again.


Do I simply lower my sizing die down some more? Or do I have a bigger issue?
-Now that I have trimmed all my brass, am I going to be in trouble (brass to short)?
Is this an issue because this brass wasn't all fire formed in my chamber?