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RCBS Steel Neck Bushings are essential for achieving the right tension on the bullet when utilizing RCBS Gold Medal Match sizing dies. These bushings are interchangeable, providing reloaders with options to choose the appropriate bushing for the proper amount of tension. Utilizing a precisely fitted Steel Neck Bushing prevents work hardening on case neck brass, extending the lifespan of the case and improving accuracy. These bushings feature self-centering capabilities for perfect alignment with the case neck. It is recommended to use high-end brass with consistent neck thicknesses for optimal results. These bushings come in bare steel and require traditional case lubrication for use. It's important to note that RCBS Steel Neck Bushings should only be used in conjunction with RCBS Gold Medal sizing dies. RCBS recommends having neck bushings that are one to two sizes above and below the target diameter. This ensures consistency in ammo loading with your Gold Medal Match sizing dies. To select the appropriate steel neck bushings, there are two methods. Firstly, measure the outside neck diameter of your loaded cartridge and subtract .002" to .003". This will allow approximately .001" of brass to spring back for the correct neck tension. Secondly, measure the neck wall thickness of your case, multiply by two, add the bullet's diameter and subtract .002" to .003". Brownells Gun Tech™ Tip stresses that RCBS Steel Neck Bushings are a critical component when loading extremely consistent-shooting ammo with your Gold Medal Match sizing dies.