I have not seen cases sized like that before. Most auto cases like 380, 9MM and 45 all have tapered cases which set the seating depth in the barrel of the gun. if the taper is too large the bolt will not close but if the taper is too small the firing pin will not strike the primer and the gun will not fire. Is that a bullet sizing die that you are using? I use them to size the bullet or projectile after molding them in a split cavity mold.
Dennis