Originally Posted by
PommyMcPomFace
Standard seems to be to screw in til the die touches the shell plate, lower the ram and screw in another 1/4 turn. Otherwise, mechanical play and stacking of tolerances in the press and die threads means with a case in the mix, you might not be pushing the shoulders down at all. If the press and plate touch without a case, you'll likely see a small gap when there is a case in there.
I recommend taking the expander out until you've figured it out, else repeatedly sizing the neck is just going to work harden your brass.