Lyman 45 Caliber Short Black Powder Taper Crimp Die 7153124 The Lyman 45 Caliber Black Powder Taper Crimp Die (Short) requires compression for proper ignition. This requires firm neck tension to hold the bullet without damage. The Taper Crimp Die has a minimum taper that allows the reloader to apply the proper neck tension without damaging the bullet for best accuracy. Specifications: - Material: Steel - Taper Crimp Die Size: Short - Cartridge: 45 Caliber