Originally Posted by ar15barrels
Do you have two dies in the toolhead across from the dillon trimmer?
These two dies should be set down hard against the shellplate WITHOUT a case in the shellplate.
THEN adjust the trim die to proper headspace.
The two dies support the shellplate platform from flexing during sizing.
This will make the headspace length more consistent.
I would expect them all to be within about 0.003".
Randall, thanks - I do have two dies in the toolhead across from the trimmer. But I hadn't tried setting them down against the shellplate before setting the headspace. I was trying to do that afterwards.
0.003" would be great. I'll give it a try.