RCBS’s .22 Nosler Two-Die Set consists of a full-length sizing die with an expander-decapping pin, and a seater die. The full-length sizing die in the RCBS .22 Nosler Two-Die Set brings the outside of the case back to SAAMI-minimum cartridge dimensions along its whole length – the most thorough way to resize. It also removes the spent primer and expands the neck to accept a new bullet. RCBS sizing dies have has vents to prevent case denting caused by trapped lube or air. Headspace is held to minimum tolerances to avoid changing the case body length during full length sizing. The seater die in the RCBS .22 Nosler Two-Die Set has a built-in roll crimper to secure the bullet as so Mfg: Rcbs