RCBS Tungsten Coated Neck Sizing Bushings provide precise bullet tension without needing traditional case lube due to their Tungsten Disulfide coating.
Designed for use with RCBS Gold Medal Match neck sizing dies, they should be selected based on case neck thickness and bullet diameter for optimal alignment.
RCBS advises owning multiple bushings around the target diameter for the best reloading results, typically one to two sizes above and below the desired measurement.