RCBS 2-Die Set 257 Roberts - 12501

This 2-die set is intended for reloading bottleneck cases, and consists of a full-length sizer die with an expander-decapping unit, and a seater die with bullet seater plug. The full-length sizer die brings the case to SAAMI minimum cartridge dimensions. It sizes the outside of the case, de-primes and expands the neck to accept the bullet. The die has vents to prevent case damage caused by trapped air and for excessive lubricant. Headspace is held to minimum tolerances to avoid changing the case