For reloaders demanding optimal case consistency and seating precision, RCBS full-length die sets deliver with expertly machined proprietary die steel, shaped to exacting tolerances and finished to a high polish for smooth, reliable performance. These die sets are purpose-built for reloading bottleneck cartridges and include two essential components: a full-length sizer die with an expander-decapping unit and a Seater Die equipped with a bullet seater plug. The full-length sizer die restores fired cases to their proper SAAMI specifications by resizing the entire case, expanding the neck to accept a new bullet and decapping the spent primer. To protect the case, it features venting to reduce pressure build-up from trapped air or excess lube. RCBS also maintains ultra-tight headspace tolerances to prevent over-sizing or altering case body length. The Seater Die provides uniform seating depth while its integrated roll crimper simultaneously locks the bullet into place, ensuring consistent results in every round. Threaded to standard 7/8 inches -14 for reloading die compatibility Built from proprietary die steel for exceptional durability and long-lasting performance Includes full length sizing die and bullet seating die for precision reloading Sizing die reshapes brass cases to SAAMI specs for safe, uniform reloading Ships conveniently packed in a green die box Proudly made in the USA for superior quality and reliability