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Straight casees don't seem to stretch much with expanding and forming. It's more squishing than pulling.

Shouldered cases do "hang up" on the expander coming out, some cartridges more than others. Turn of the century, small caliber, slope-shoulders seem to grow more than modern high angle shouldered rounds.

Using inside neck lube or hardware store powdered graphite (for locks) reduces the "pull" a lot.

I trim after forming because a lot of stretch can occur in the shouldered cases, taking you over the top. Straight walls aren't as fussy.
 
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