I attempted it on my new Winchesteer brass and just broke the sharp fringe of the primer pocket, "problem" vanished. This is an more mature thread, you may not get a response, and will be reviving an outdated thread. Please take into consideration making a new thread. Include to quote https://winchester-small-rifle-pr49494.blogdon.net/federal-gm150m-primers-can-be-fun-for-anyone-48080834