I have been having a problem with my brass having black streaks and some type of soot on them after being fired. I think that my lube is causing it. I am using Carnuba Red and pan lubing. I am using an "M" die to expand the case enough that the first band of my (Lee 158 RNFP) boolit can slip in. I am using a heavy crimp. I was wondering if my lube is somehow getting on the case as it is fired. The brass is new and after firing it has sticky soot that wipes of some but leaves a stain in the brass. The brass does not seem to have any lube on it before it is fired. On an up note, the round is really accurate.
It is the sticky part that has me bugged.