RCBS Carbide Roll Crimp 3 Die Set - Group B - Popular Pistol Cartridges - .357 Mag / .38 Spl / .357 Mag 18212

RCBS pioneered and developed 3-Die Sets for straight-wall rifle and pistol cases. The Carbide Sizer Die sizes the case and de-primes (the carbide sizer ring eliminates the need to lubricate). 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 roll crimps.