RCBS Tungsten Coated Neck Sizing Bushings provide precise bullet tension without needing traditional case lube, due to their WS2 coating.
These bushings are designed for use with RCBS Gold Medal Match neck sizing dies and should be self-centered for proper case neck alignment.
To select the correct bushing size, measure your loaded cartridge's outside neck diameter or case neck wall thickness and subtract .002" to .003" for optimal neck tension.