Description
The Forster 0.334 neck bushing is the small piece that gives you big control over how your brass gets sized. It sets the outside neck diameter inside your Forster Precision Plus Bushing Bump Neck Sizing Die, so instead of sizing every neck the same way no matter the brass, you choose exactly how much tension you want on the bullet. That little bit of control is what separates good reloads from really consistent ones.
How the 0.334 Forster Bushing Dials In Your Neck Tension
Neck wall thickness changes from one brass brand to the next, and sometimes even case to case within the same box. Swapping in the right bushing lets you work around that. The general rule is to pick a bushing roughly .002 inch smaller than a loaded round measures at the case neck, which gives you proper bullet grip without overworking the brass. Forster offers these in .001 inch steps, so if the 0.334 is close but not quite where you want it, you can fine tune up or down and find your sweet spot.
Why the Finish on This Neck Bushing Matters
Forster heat treats these bushings and then runs them through a cryogenic process in an aircraft-quality lab. The result is an ultra-smooth interior that Forster describes as smooth as silk. That matters because a slick bushing drags less on the brass as it passes through, which keeps runout down and helps your necks come out straighter and more concentric. Over time, sizing the neck down only as much as needed also means your cases last longer before they need to be tossed.
Fitment for the 0.334 Forster Neck Bushing
This is a standalone bushing, sold on its own, and it drops into Forster's Bushing Bump Neck Sizing Dies. It is not cross-compatible with Redding, Wilson, or other brands of bushings, so it belongs specifically in a Forster setup. If you already run the Precision Plus die, this bushing slides right in and you are ready to size.
Key Specifications
- Diameter: 0.334 inch
- Manufacturer: Forster Products
- Manufacturer Part Number: BUSH-334
- UPC: 757253998225
- Sizing Increments: Available in .001 inch steps
- Material Finish: Heat treated and cryogenically treated
- Compatibility: Forster Precision Plus Bushing Bump Neck Sizing Dies
- Cross-Brand Compatibility: Not compatible with Redding or Wilson bushings
- Quantity: 1 bushing
- Country of Origin: United States
What’s Included
- One Forster 0.334 neck bushing (BUSH-334)
Frequently Asked Questions
What die does the Forster 0.334 neck bushing fit?
This bushing is made for the Forster Precision Plus Bushing Bump Neck Sizing Dies. It is designed specifically for Forster dies and will not work with Redding, Wilson, or other brands of bushings. If you run a Forster bump die, it drops right in.
How do I pick the right bushing size?
Measure the neck diameter of a loaded round, then choose a bushing about .002 inch smaller than that measurement. That gives you proper neck tension on the bullet without overworking the brass. Forster makes these in .001 inch increments, so you can fine tune up or down to match your brass and your preferred tension.
Does this bushing come with the die, or is it sold separately?
This is a standalone bushing sold on its own. The Bushing Bump Neck Sizing Die does not include bushings in the box, so you add the exact size or sizes you need for your brass. It is a good idea to keep a couple of sizes on hand to account for differences in case neck wall thickness.
What is the benefit of the cryogenic treatment on Forster bushings?
After heat treating, Forster runs these bushings through a cryogenic process to create an extremely smooth interior surface. That smoother finish lets the brass pass through with less drag, which helps keep runout low and produces straighter, more concentric necks. It also contributes to long bushing life.




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