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.
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Catfish
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