The L.E. Wilson Neck Sizing Die Bushing 336 is a hardened stainless steel neck bushing designed for precision hand loaders who want repeatable, consistent neck tension on their rifle cartridges. If you're running a Wilson neck sizing die and need to dial in your brass for tighter or more forgiving fit, this bushing gives you the control that separates handloaded ammo from factory rounds—and it's built to Wilson's tight tolerances.
Wilson manufactures these neck bushings in .001" increments, so you can fine-tune your sizing in small steps. The marked size refers to the middle of the bushing, which is reamed with a .003" taper. This design matters: since your case neck only reaches the bushing's middle during sizing, you can flip the bushing over (markings facing down toward the case) to achieve a slightly tighter sizing fit. That's handy if your brass has work-hardened and springs back more than usual, or if you want to dial in less squeeze than the next smaller bushing would give you. It's a practical detail that separates a good bushing from one that forces you to buy an extra size you don't really need.
The 336 bushing is made to similar specifications as Redding neck bushings, so if you're familiar with that brand, the concept will be immediately comfortable. Fair warning: these Wilson bushings are not interchangeable with Forster or RCBS dies, so confirm your die manufacturer before ordering. For selecting the right size, measure your loaded cartridge's outside neck diameter and subtract .002" to .003" to account for brass spring-back and proper neck tension. Alternatively, measure your case neck wall thickness, multiply by two, add your bullet diameter, then subtract .002" to .003"—both methods work; pick whichever fits your workflow.
Key Features
- Hardened stainless steel construction for durability and precision
- Manufactured in .001" increments for fine-tuning neck tension
- .003" taper reamed into the bushing middle
- Reversible design—flip to achieve tighter sizing without buying a smaller bushing
- Ideal for work-hardened brass or when you need precise neck control
- Wilson die compatible; not interchangeable with Forster or RCBS
Specifications
| Brand | L.E. Wilson |
| Product Type | Neck Sizing Die Bushing |
| Material | Hardened Stainless Steel |
| Size Increment | .001" |
| Taper | .003" |
| Compatibility | L.E. Wilson neck sizing dies only |
Frequently Asked Questions
What die systems is the L.E. Wilson 336 bushing compatible with?
The Wilson 336 bushing is designed for L.E. Wilson neck sizing dies only. It will not work with Forster or RCBS dies, so verify your die brand before purchasing.
How do I know which size bushing I need?
Measure your loaded cartridge's outside neck diameter and subtract .002" to .003" to account for brass spring-back. Alternatively, measure your case neck wall thickness, multiply by two, add your bullet diameter, and subtract .002" to .003". Either method will give you the correct bushing size for proper neck tension.
Can I use the bushing upside down for different sizing results?
Yes. The bushing is reversible—flip it so the markings face down toward the case to achieve a slightly tighter sizing fit. This is useful if your brass has work-hardened and springs back too much, or if you want less squeeze than moving to the next smaller bushing would provide.
What's the advantage of having .001" size increments?
The .001" increments allow you to dial in your neck tension precisely without being forced to jump to a much tighter or looser fit. Combined with the reversible design, you have very fine control over how much the bushing squeezes your case neck.
