Case Neck stuck on Expander

[Catfish]

Petey,
I never have that probley because I only neck size and I dip my csae mouthes in a can of number 12 shot and mica. With the 7mm neck sizeing may or may not work well, but Mid-Way, and probly several others, sell an inside neck luber which is just a cal. brush which wipes some mica on the inside of the case neck. Mica won`t ruin your powder eather.