RCBS 3-Die Taper Crimp Set - Group C .400 Legend. Its steel Sizer Die sizes the case and de-primes. Note: Cases must be lubricated. The Expander Die expands the case to the proper diameter to accept the bullet and it imparts case mouth flare/bell for bullet feeding. The Seater Die seats the bullet and taper crimps. Specifications for RCBS 3-Die Taper Crimp Set - Group C: Manufacturer: RCBS Caliber: .400 legend Projectile Caliber: .400 Caliber Features of RCBS 3-Die Taper Crimp Set - Group C Features a hardened steel Sizer Die (case lubrication required) Expander Die to properly expand case to accept bullets Taper Crimp Seat Die for Proper cartridge headspacing Comes in a green storage box All RCBS dies are machined to exacting tolerances hardened and finished to the highest standards in the industry Package Contents: RCBS 3-Die Taper Crimp Set - Group C RCBS 22004: 3-Die Taper Crimp Set - Group C .400 Legend