Fella's;
We, the 900F family, recently bought the Dillon calenders. The Aero went to my son in Iraq. The Precision stayed in my reloading room. The Aero features machine guns, and avaition as well as the models. The Aero models might be a touch more likely to wind up the excessively P.C.'ed & make them spin about the room frothing at the mouth or keyboard as the case may be.
900F