I was doing alot (100+) fireforming cases. Small amount of rifle powder, 1/4 sheet of single layer tp, about 1/3 case of dry cornmeal another 1/4 sheet tp. Each time packed down with a wooden dowel. After 50 or so fireformings the barrel clogged with tp and cornmeal. I had 1 heck of a time, hours to get it cleared. Has anyone ever experienced anything like this? The cornmeal had been kept in a refrigerator to keep it dry. The powder was sufficient that I had to use a wooden box stuffed with paper and cloth to keep from box from damage. I tried cardboard but it blew through quickly. I was getting good shoulders from this forming.