Description
The Forster 0.338" Neck Bushing is one of those small parts that makes a big difference at the bench. It drops into Forster's Bushing Bump Neck Sizing Dies and Bushing Full Length Sizing Dies, giving you direct control over how much your case necks get worked and exactly how much grip your bullets see. Instead of relying on a one-size-fits-all expander, the bushing itself sets the inside neck diameter, so your loaded rounds come out with the tension you want for your brass and your rifle.
Why the 0.338 Bushing Earns Its Spot
Forster machines these bushings to a very fine interior finish, then runs them through a super-cooling cryogenic process. That treatment refines and closes up the steel's surface so the bushing sizes smooth as silk, pass after pass, and holds up over a long reloading life. The bushings are heat treated and honed to the precise inside diameter stamped on them, so a 0.338 is a true 0.338. You get the kind of concentricity and repeatability that serious handloaders chase when they want tighter groups and longer case life.
Picking the Right Bushing Size
Forster's bushings come in 0.001 inch increments, which lets you fine-tune for your exact brass and neck wall thickness. A good starting point is to measure the outside neck diameter of a few loaded rounds and choose a bushing roughly 0.002 inch smaller than that measurement. If you want a bit more bullet grip, step down another thousandth. Having a couple of sizes on hand around your target number is never a bad idea once you start chasing consistency.
What It Fits
This is a Forster-specific bushing. It is designed to work in Forster's Bushing Bump and Bushing Full Length Sizing Dies and is not cross-compatible with Redding or L.E. Wilson bushings, so keep that in mind if you run a mixed die setup. If you already own a Forster bushing die, this 0.338 slots right in and gets you back to loading.
Key Specifications
- Manufacturer: Forster Products
- Manufacturer Part Number: BUSH-338
- UPC: 757253998188
- Diameter: 0.338 in
- Material: Cryogenically treated steel
- Size Increments: 0.001 in
- Compatibility: Forster Bushing Bump & Bushing Full Length Sizing Dies
- Quantity: 1 bushing
- Country of Origin: USA
What’s Included
- One Forster 0.338" neck bushing (BUSH-338)
Frequently Asked Questions
What dies does the Forster 0.338" neck bushing work with?
It's made for Forster's Bushing Bump Neck Sizing Dies and Bushing Full Length Sizing Dies. It is not interchangeable with Redding or L.E. Wilson bushings, so it's meant to stay in the Forster family of dies. If you run a Forster bushing die, this one fits right in.
How do I know if the 0.338 is the right bushing size for my load?
Measure the outside neck diameter of several loaded rounds and pick a bushing about 0.002 inch smaller than that measurement. If your loaded necks measure right around 0.340, the 0.338 is a solid starting point. For a touch more bullet grip, you can drop down another thousandth.
Why is the bushing cryogenically treated?
Forster runs these bushings through a super-cooling cryogenic process that refines and closes up the steel's surface. That gives you a smoother sizing action and longer service life out of the bushing. The result is more consistent neck tension and better loaded rounds.
Can one bushing cover different amounts of neck sizing?
Yes. The bushing sets the inside neck diameter, but in a Bushing Bump die you can adjust the spindle to size only part of the neck or the full length. That flexibility lets you avoid overworking the brass while still dialing in the tension you want.



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