I tried it on my new Winchesteer brass and just broke the sharp fringe of the primer pocket, "trouble" vanished. I purchased 1K for 45 Colt and had the "trouble". Was almost to surrender on them, and skim a submit about employing a deburr Instrument to remove navy crimps on https://remingtonlmzym.newsbloger.com/32428386/everything-about-federal-215-large-magnum-primers