The L.E. Wilson Steel Neck Sizer Die Bushing in .257 is a hardened stainless steel precision component for reloaders who demand consistency and control over neck tension. Unlike one-size-fits-all sizing, neck bushings let you fine-tune how much crush your brass receives during the sizing stroke—critical for achieving the repeatable case neck tension that accurate handloads depend on. Wilson manufactures these bushings in .001" increments, giving you granular control that generic sizing dies simply don't offer.
This .257 bushing is designed for use with L.E. Wilson neck sizer dies and works within their tapered bushing system. The marked size refers to the middle of the bushing, which is reamed with a .003" taper. Because case necks only reach the bushing's middle section, you have two sizing options: use the bushing normally for standard neck tension, or flip it (markings facing the case) to achieve slightly tighter sizing for hardened brass that's lost tension or when you need fine-tuning beyond what the next smaller bushing would provide. This flexibility can extend brass life and solve seating issues without forcing you to buy additional components.
Selection is straightforward: measure your loaded cartridge's outside neck diameter and subtract .002" to .003" to account for brass spring-back, or use the alternative method of measuring case neck wall thickness, doubling it, adding your bullet's diameter, then subtracting .002" to .003". Wilson's specs are comparable to Redding neck bushings, though they are not compatible with Forster or RCBS dies—confirm your die manufacturer before ordering.
