Interesting. I have ruined most of my 7 rm brass by using a primer pocket uniforming tool from Redding. I was over zealous with the tool chucked in a drill. The pockets look perfect, shinny, and very sharp corners in the bottom of the pocket. I was so proud of my brass until I primed, loaded and fired the loads. The primers had seated with different pressures, and the primer depth was also not uniform. Many primers were 0.006"-0.010" below flush. I now have about 300+ hulls that I am planning to scrap, or use for destructive testing such as setting shoulders back, and other stuff. I wonder if the ball bearing fix will work.