I do use the white motor mica on one out of every third or 4th case. My cases last night were stuck inside the die not because of the expander ball. The case was stuck when it was nearly all of the way inside the die at the top of the stroke. At that point the expander is basically just pushing out the spent primer. I tumble my brass again for about 15minutes after sizing to remove the sizing lube so that should remove any lube that has gotten inside the neck. I am going back to my RCBS lube and pad or try some Imperial sizing wax or Crisco like one person suggested.
