RCBS Steel Neck Sizing Bushings provide precise tension on bullets when used with RCBS Gold Medal Match sizing dies, improving accuracy and prolonging case life.
For proper alignment and best results, high-end brass with consistent neck thicknesses is recommended, and bushings should be used in-the-white with traditional lubrication.
Selection of the correct bushing size involves measuring the loaded cartridge's outside neck diameter or the case's neck wall thickness, then subtracting .002" to .003" for optimal neck tension.