I used up the last of my Goex 4f a while back and broke into a new can of Schuetzen 4f for priming. The Schuetzen leaves a hard black residue in the pan upon firing. As in I can’t even wipe it out, I have to scrape it out with my vent pick. I polished the pan and that did not help, the residue still stays stuck. To be fair, I probably use more prime than I really need and may play with reduced priming and see if that helps. Anybody else notice this with Schuetzen 4f?