RCBS Tungsten Coated Neck Sizing Bushings provide precise bullet tension without traditional lube, due to their Tungsten Disulfide coating.
These bushings are self-centering and should be used with RCBS Gold Medal Match neck sizing dies for best results.
To select the correct bushing size, subtract .002" to .003" from the loaded cartridge's outside neck diameter or calculate using case neck wall thickness and bullet diameter.