RCBS Steel Neck Bushings are designed to provide the right tension on the bullet with RCBS Gold Medal Match sizing dies, enhancing accuracy and extending case life.
Bushings require traditional case lubrication as they come "in-the-white" and should be self-centering for proper case neck alignment.
To select the correct bushing size, subtract .002" to .003" from the loaded cartridge's outside neck diameter or calculate based on case neck wall thickness and bullet diameter.