The L.E. Wilson Steel Neck Sizer Die Bushing .305 is a hardened stainless steel neck bushing designed for reloaders who need precision control over case neck sizing. Wilson neck bushings are manufactured in .001" increments, giving you fine-tuning capability that goes well beyond what standard sizing dies alone can provide. If you're working with a full-length sizer die or neck-sizing die that uses interchangeable bushings, this .305 bushing lets you dial in the exact neck tension your loads demand—critical for consistent velocities, tight groups, and repeatable performance on the range or in the field.
The .305 marking on the bushing refers to the middle diameter, which is reamed with a .003" taper. This design means the case neck contacts only the middle section of the bushing during sizing. For standard sizing, install the bushing markings-up. If you need a slightly tighter squeeze—useful when brass has work-hardened and lost neck tension, or when you're fine-tuning to achieve less “grip” on the bullet than the next smaller bushing would provide—you can flip the bushing over so the markings face down toward the case. This reversibility gives you two effective sizes from one bushing, a handy option when you're chasing the perfect load without buying a second bushing.
L.E. Wilson bushings are built to similar specifications as Redding neck bushings but are not compatible with Forster or RCBS dies. Before ordering, measure your loaded cartridge's outside neck diameter and subtract .002" to .003" to account for brass spring-back, or measure your case neck wall thickness, multiply by two, add your bullet diameter, and subtract .002" to .003". This bushing is built tough and sized precisely for the reloader who treats neck tension as a load variable—not an afterthought.
Key Features
- Hardened stainless steel construction for durability
- Manufactured in .001" increments for precise sizing control
- Reversible design: use standard orientation or flip for tighter sizing without buying another bushing
- .003" taper reamed into middle of bushing for controlled neck contact
- Compatible with L.E. Wilson and Redding-style dies
- Ideal for precision reloading and load development
Specifications
| Brand | L.E. Wilson |
| Product Type | Steel Neck Sizer Die Bushing |
| Size | .305 |
| Material | Hardened stainless steel |
| Bushing Taper | .003" |
| Manufacturing Tolerance | .001" increments |
Frequently Asked Questions
Will this bushing fit my Forster or RCBS die?
No. L.E. Wilson neck bushings are not compatible with Forster or RCBS dies. They work with L.E. Wilson dies and Redding-style neck-sizing dies. Verify your die type before ordering.
How do I know which bushing size I need?
There are two methods: (1) Measure the outside neck diameter of a loaded cartridge and subtract .002" to .003" to allow for brass spring-back. (2) Measure your case neck wall thickness, multiply by two, add your bullet diameter, and subtract .002" to .003". The .305 marking on this bushing refers to the middle diameter where the case neck actually contacts during sizing.
What does it mean to flip the bushing over?
The bushing is reversible. Normally, you install it markings-up. If you flip it so the markings face down toward the case, the case neck contacts a slightly tighter portion of the bushing, providing a tighter squeeze on the bullet without needing to buy a smaller bushing. This is useful for emergency adjustments when brass has hardened or for fine-tuning neck tension during load development.
Why is neck tension important in reloading?
Neck tension controls how tightly the case grips the bullet. Consistent, correct neck tension reduces velocity variation, improves accuracy, and helps prevent both bullet pull and excessive pressures. This is why dedicated neck-sizing bushings are valued by precision reloaders.
