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RCBS offers Steel Neck Bushings that can be easily interchanged to provide the reloader with the precise amount of tension needed for the bullet when using RCBS Gold Medal Match sizing dies. This reduces work hardening of the case neck brass, which in turn prolongs case life and improves accuracy. The steel neck bushings are self-centering to ensure proper alignment with the case neck. For optimum results, RCBS recommends using high-end brass with consistent neck thicknesses. The bushings come in bare steel, so traditional case lubrication is required. These steel neck bushings are compatible only with RCBS Gold Medal sizing dies.

To achieve extremely consistent-shooting ammo with Gold Medal Match sizing dies, RCBS recommends having neck bushings that are one to two sizes above and below the target diameter. Brownells Gun Tech™ Tip suggests two ways of selecting the steel neck bushings: 1) by measuring the outside neck diameter of the loaded cartridge and subtracting .002" to .003" to allow approximately .001" of brass for correct neck tension or 2) by measuring the neck wall thickness of the case, multiplying by two, adding the diameter of the bullet, and subtracting .002" to .003".