Rcbs standard taper crimp die set.50ae/.50sw gp-b FEATURES-Caliber: .50AE/.50 Smith & Wesson-The 3-Die Roll Crimp Set is for loading straight-wall cartridges-Its steel Sizer Die sized the case & de-primes-Note: Cases must be lubricated-The Expander Die expands the case to the proper diameter to accept the bullet, & it impartscase mouth flare/bell for bullet feeding-The Seater Die seats the bullet & taper crimps