I tried it on my new Winchesteer brass and just broke the sharp edge of the primer pocket, "difficulty" vanished. Initially I didn't have the security info. Then realized how a person could just consider that information and get into problems. Ah hah! That points out why the Speer manual, https://zionbhmjg.pages10.com/not-known-facts-about-federal-m215-primers-67362473