Not sure if i have asked this question before. I usually come across wartime .303 cases and unfired nickle and copper heads. I could as i have done in the past in my shooting days collet crimp the heads but would prefer to form the original crimp that gives three crimp groves around the neck. Anyone in the shooting world that makes reloading dies that form the original three grove crimp. I was thinking about modifying cheap set of Lee crimp die to do this.