RCBS Tungsten Coated Neck Sizing Bushings provide optimal bullet tension without the need for traditional case lube, thanks to their Tungsten Disulfide coating.
These bushings are designed for use exclusively with RCBS Gold Medal Match neck sizing dies and are self-centering for proper case neck alignment.
To select the correct bushing size, measure the loaded cartridge's outside neck diameter and subtract .002"-.003" or calculate based on neck wall thickness and bullet diameter.