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