L.E. Wilson Neck Sizing Die Bushing .309" - B-309

This neck sizing die bushing is designed to fit into L.E. Wilson neck dies and sizes the case neck to properly grip the bullet. The .309" bushing is calculated by measuring a loaded round's neck diameter and subtracting .002" to .003", or by measuring case wall thickness, doubling it, adding bullet diameter, then subtracting .002" to .003". Essential component for precision handloaders seeking consistent neck tension.