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RCBS Steel Neck Bushings are designed to provide the perfect amount of bullet tension when paired with RCBS Gold Medal Match sizing dies. These interchangeable bushings are precision fitted to reduce work hardening of the case neck brass, which helps prolong case life and improve accuracy. They are self-centering to ensure proper alignment with the case neck, but it is recommended to use high-quality brass with consistent neck thicknesses for optimal results. Bushings come bare steel, so traditional case lubrication is required. These bushings are exclusive to RCBS Gold Medal sizing dies, and it is suggested to have neck bushings that are one to two sizes above and below the desired diameter for optimum performance. To determine the correct bushing size, Brownells Gun Tech suggests two options: measuring the outside neck diameter of the loaded cartridge, subtracting .002" to .003", and allowing approximately .001" of brass to spring back for neck tension or measuring the neck wall thickness of the case, multiplying by two, adding the bullet diameter, and subtracting .002" to .003".