For those of you that form your own from 223, when running them through the sizing die do you just run it through once before you trim it or do you run it through 2+ times?

I cut mine before it hits the sizing die so that I don't have to remove the expander rod, but when sizing I'll run it through a second time before it gets trimmed. Just curious as to whether this is an unneeded step or if it helps in the long run. I'd imagine that it would just help smooth out the shoulder, which is why I started doing it... But then again, my dad is a millwright and to him anything worth doing is worth overdoing. Maybe I picked up a bit of that habit after all