Thread: 223 Expander mandrel size?

Evening all
So I’ve just been watching some Eric Cortina videos, and he’s convinced me that an expander mandrel is going to make me a world class shooter…..

Cortina’s theory is that with normal FL dies, the ball can sometimes pull the shoulder back out on the upstroke, causing inconsistent shoulder bump, therefore he suggests running your FL Die without the expander ball, and then using the mandrel, in order to expand the neck on the downstroke instead



What expander would be best for 223 rem?
I see they come in sizes 0.223 0.2225,, 0.222, etc

I’m guessing 0.222 would be pretty good?

Cheers