I have loaded a batch of misc. 9mm brass, 100 each about 5 times now with Cfe Pistol powder and Im am seeing quite a bit of blackening around the case mouths and down about 3/8 inch or so. Each time I dry tumble these about 3 hours, but the black doesn't come off. I haven't tried my wet tumbler yet, but was wondering if anyone else has noticed this with this powder. I'm complaining not because I need perfect looking 9mm brass, but this makes it hard during inspection to tell if there are any case mouth cracks.