L.E. Wilson Steel Neck Sizer Die Bushing .258 (B-258)

Description

If you're running a Wilson bushing-type die and chasing tighter groups, the right bushing is where the precision starts. This is the L.E. Wilson .258 steel neck sizer bushing, part number B-258, and it drops right into Wilson neck sizing dies and the Wilson bushing-type full length sizing die. Instead of relying on an expander ball to set neck tension, you pick the bushing diameter that gives you the exact grip on the bullet you want. Less brass working, better concentricity, and brass that lasts longer through more loading cycles.

Picking the Right .258 Wilson Bushing

Bushing size is all about math, not guesswork. The common method is to measure the outside neck diameter of a loaded round where the bullet sits, then subtract .002 to .003 from that number. That leaves roughly .001 of spring back for proper neck tension. You can also measure your case neck wall thickness, multiply by two, add your bullet diameter, then subtract that same .002 to .003. Since brass brands vary in wall thickness, it's worth keeping a couple of sizes on hand while you work up a load.

Built From Hardened Steel That Holds Up

L.E. Wilson makes these bushings in .001 increments, and the number marked on the bushing refers to the middle of the bore, which is reamed with a slight taper. A handy trick: flipping the bushing so the markings face down toward the case gives you slightly tighter sizing, which is useful when you're fine-tuning tension without buying another bushing. Being steel, these do require a little case lube on the necks to run smoothly.

These bushings aren't locked to one brand either. While they're made for Wilson dies, the universal sizing means they also fit Redding, Hornady, and RCBS bushing dies, so they play nice with most precision reloading setups you've already got on the bench.