RCBS Tungsten Coated Neck Sizing Bushings provide precise bullet tension without needing traditional case lube thanks to their Tungsten Disulfide coating.
These bushings are self-centering, ensuring proper alignment with the case neck, and are to be used exclusively with RCBS Gold Medal neck sizing dies.
It's recommended to have neck bushings in sizes one to two above and below the target diameter for optimal results and consistent-shooting ammunition.