What function did the expander mandrel perform in lowering the SD? ThanksWhat are you using to throw and weight powder. Back in my chargemaster days I could never get super low ES. Since then I have been running fx120i and running expander mandrels and I can keep my SDs in low single digits. I use a chargemaster now to do initial throw and trickle up with dandy trickler on Fx120i. I think I solved my two biggest factors that affect ES and that was powder charge consistency and neck tension.