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This is the L.E. Wilson .257 diameter steel neck sizing bushing, part number B-257. It's the small-but-critical piece that lets a bushing-type die do its job, sizing only the outside of the case neck so you control exactly how much grip the brass puts on the bullet. Each bushing is precision ground from hardened steel, and Wilson has been turning out this kind of reloading tooling since 1927, which is a big reason their bushings have such a loyal following on the bench.
Controlling neck tension is one of the most direct ways to shrink your group sizes and tighten up velocity spreads. By sizing only the neck and skipping the traditional expander ball, you work the brass less, which helps with concentricity and stretches case life. Wilson makes these in .001 inch increments, so you can land right on the number your brass and bullet combo calls for.
Two common methods get you to the correct bushing. Measure the outside neck diameter of a loaded round and subtract .002 to .003 inches, or measure your neck wall thickness, multiply by two, add your bullet diameter, then subtract that same .002 to .003. Either way you leave a touch of room for spring-back and end up with proper tension.
Wilson bushings are reamed with a slight internal taper, with the marked size referring to the middle of the bushing. That means you can flip it over so the markings face down into the die and get a hair more grip from the same bushing. It's a useful move when brass has hardened up and won't hold a bullet quite like it used to, or when you want to fine-tune tension without jumping to the next smaller size. These interchange freely across Wilson bushing-type neck sizing and full-length dies.
Measure the outside neck diameter of a loaded round and subtract .002 to .003 inches, which accounts for brass spring-back and leaves proper neck tension. You can also measure your neck wall thickness, multiply by two, add your bullet diameter, and subtract that same .002 to .003. Many reloaders keep a few neighboring sizes on hand to fine-tune for different brass lots and bullets.
Yes. The .257 bushing interchanges freely across Wilson bushing-type neck sizing dies and bushing-type full-length sizing dies. It drops right in once you remove the decapping rod and plug.
Wilson bushings are reamed with a slight internal taper, and the marked size refers to the middle of the bushing. Turning it over so the markings face down toward the case gives you a bit more grip from the same bushing. It's a handy fix when brass has work-hardened and won't hold a bullet like it used to, or for tuning tension without stepping down a full size.
No, that's one of the main appeals of a bushing setup. The bushing sizes the outside of the neck directly, so you skip the expander ball and the extra brass working that comes with it. That typically means better concentricity and longer case life.
| UPC | 815145024473 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | B-257 |
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