Here are the details: Dillon XL650 w/UniqueTek Toolhead Clamp Kit Station 1: Dillon Sizer/Deprimer die Station 2: Dillon powder die and powder dispenser Station 3: Empty Station 4: Redding Competition Micrometer seater die Station 5: Lee Carbide Factory Crimp/Full-length Sizer die I've been loading .45ACP on this press with the same die setup for almost a year with excellent results (OAL variance of +- .002"). Berry's 230gr Plated RN @ 1.260". (Montana Gold 230gr CMJ varied +- .005 due to ogive.) I started loading 9mm and OAL variance is +- .005. 124gr Berry's Plated RN. I've loaded ~500rnds. My dies are clean. Everything is tight. The rotating case retention plate is tight without binding. I'm using mixed already-fired range brass. So what's the deal?? Are my cases not clean enough? Is it case length difference? Is it just the bullet shape matched to the seating die shape? Thanks for your comments and experience.