The L.E. Wilson Neck Sizing Die Bushing 310 is a hardened stainless steel neck bushing built for precision reloaders who demand consistent neck tension and concentricity shot after shot. Whether you're fine-tuning loads for match-grade accuracy or managing brass that's been fired multiple times, this neck sizing die bushing gives you the control to dial in exactly the fit you need without stepping up to the next smaller bushing size.
Wilson manufactures their bushings in .001" increments, and the marked size refers to the middle of the bushing—which is reamed with a .003" taper. Since the case neck only reaches the bushing's center, you have flexibility in how you use it. Run it marked-side up for standard sizing, or flip it over (markings facing the case) for a slightly tighter squeeze when brass has hardened and lost tension, or when you're chasing that last bit of neck consistency. Most reloaders will use the standard orientation, but that reversible design is handy insurance if your brass springs back more than expected.
Built to specs comparable to Redding neck bushings, the Wilson bushing delivers the accuracy-focused reloader what they expect: a durable, precisely reamed steel component that won't vary from cartridge to cartridge. Note that Wilson bushings are not compatible with Forster or RCBS dies—confirm your die manufacturer before ordering. If you're already running a Wilson die set or switching to one, this bushing integrates seamlessly into your reloading process and helps you maintain the kind of neck tension that feeds reliable, accurate ammunition.
Key Features
- Hardened stainless steel construction for durability and precision
- Manufactured in .001" incremental sizes for fine-tuned neck tension
- .003" taper reamed into the bushing for consistent case centering
- Reversible design allows tighter sizing when flipped (markings facing case) for emergency hardened brass or custom load tuning
- Compatible with L.E. Wilson neck sizing dies; not compatible with Forster or RCBS dies
Specifications
| Brand | L.E. Wilson |
| Product Type | Neck Sizing Die Bushing |
| Material | Hardened Stainless Steel |
| Size Designation | 310 |
| Size Increment | .001" |
| Bushing Taper | .003" |
| Die Compatibility | L.E. Wilson dies only; not compatible with Forster or RCBS |
Frequently Asked Questions
What size neck bushing do I need?
Measure the outside neck diameter of a loaded cartridge and subtract .002" to .003" to account for brass spring-back and correct neck tension. Alternatively, measure your case neck wall thickness, multiply by two, add your bullet diameter, then subtract .002" to .003". Wilson's .001" increments let you dial in the exact size without jumping to the next standard step.
Can I use this Wilson bushing in my Forster or RCBS die?
No. Wilson neck bushings are not compatible with Forster or RCBS dies. Confirm your die brand before ordering to ensure compatibility.
What does it mean to flip the bushing over, and when would I do that?
The bushing is marked on one end and reamed with a taper. In normal use, the marked side faces away from the case. Flipping it so markings face the case reduces the bushing's inner diameter slightly, creating a tighter squeeze. This is mainly useful if your brass has hardened and springs back excessively, or if you want to fine-tune neck tension without moving to a smaller bushing size.
Is the Wilson bushing similar to Redding neck bushings?
Yes. Wilson manufactures their bushings to specs comparable to Redding's. Both are precision steel bushings used in neck sizing dies, though they are not interchangeable between die brands.
