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This is the L.E. Wilson Steel Neck Sizer Die Bushing in the .251 size, part number B-251. It's a small part that does a big job: it slips into your Wilson sizing die and resizes the outside of the case neck to the exact diameter you need, giving you direct control over how tightly your brass grips the bullet. Instead of relying on an expander ball to work the neck from the inside, a bushing system sizes from the outside, which means less brass stress, better concentricity, and longer case life. L.E. Wilson has been turning out precision reloading tools for over 80 years, and these bushings are machined right here in the USA.
The B-251 drops into Wilson neck sizing dies and Wilson bushing-type full length sizing dies. Because bushings follow a universal standard, it also interchanges with Redding, RCBS, and Whidden dies, so you're not locked into one brand. One nice touch on Wilson bushings is the slight taper from end to end, which gives you roughly .0005 of extra tension if you flip it over. Little tricks like that come in handy during load development when you're chasing that perfect feel on the seating stroke.
Getting the size right is the whole game here. Measure the outside neck diameter of a loaded round where the bullet sits, then subtract .002 to .003 of an inch to account for brass springback. If you prefer working from scratch, measure your neck wall thickness, multiply by two, add the bullet diameter, then subtract that same .002 to .003. Either method lands you on a bushing that holds your bullet with consistent, repeatable tension round after round.
Steel bushings like this one are a favorite for load workup because they're accurate, tough, and easy to live with. A quick wipe of light lube on the necks keeps things smooth, and you'd be hard pressed to wear one out. For precision reloaders who want to tune their ammo rather than just crank it out, this is one of the simplest upgrades you can make.
Measure the outside neck diameter of a loaded round where the bullet sits, then subtract .002 to .003 of an inch to account for brass springback. If that math lands you near .251, the B-251 is your bushing. You can also measure neck wall thickness, double it, add bullet diameter, and subtract .002 to .003 to get there.
Yes. Neck sizing bushings follow a universal standard, so this Wilson bushing interchanges with Redding, RCBS, and Whidden bushing-style dies. Many reloaders mix and match brands in the same die without any trouble.
Steel bushings are accurate, durable, and budget-friendly, which makes them popular for load development and for anyone turning necks since the sized diameter may change. A quick wipe of light neck lube keeps sizing smooth. Titanium nitride adds a slicker coating, but a steel bushing like this one holds up for a very long time.
Correct. A bushing sizes the outside of the case neck to your chosen diameter, so there's no need to run an expander ball through the inside. That reduces brass working, improves concentricity, and helps extend case life.
| UPC | 815145024411 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | B-251 |
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