Description
This is Forster's .303 diameter neck bushing (part number BUSH-303), a single steel insert that lets you fine-tune case neck diameter in Forster's Bushing Bump Neck Sizing Dies and Bushing Full Length Sizing Dies. Instead of relying on an expander ball and a one-size-fits-all approach, the bushing does the sizing work, so you control exactly how much your neck gets squeezed and how much grip you put on the bullet.
Why the .303 Neck Bushing Earns Its Spot
Forster runs its bushings through a super-cooling cryogenic process after heat treating. That treatment refines and closes up the surface of the steel, which gives you a slicker finish and a longer service life. Each bushing is then honed to the exact inside diameter stamped on it, so the .303 you order sizes to .303 and does its job without surprises. A smoother bushing means less drag on the brass and straighter loaded rounds coming off the press.
Picking the Right Bushing Size
The trick with bushing sizing is matching the bushing to your brass, not just your caliber. A good starting point is to measure a loaded round at the neck, then choose a bushing roughly .002 inch under that number. Bushings come in .001 inch steps, so once you know your brass wall thickness and the neck tension you're after, you can walk right up to the size that shoots best in your rifle.
A Few Things Worth Knowing
These bushings are made to work with Forster's own dies and will not fit Redding or L.E. Wilson bushing dies, so keep that in mind if you're mixing brands on your bench. One handy bonus of the Bushing Bump system is that you can pull the bushing entirely and still use the die to bump the shoulder without touching neck diameter. It's a simple part, but for anyone chasing tighter groups and better concentricity, having the right bushing on hand makes a real difference.
Key Specifications
- Manufacturer: Forster Products
- Manufacturer Part Number: BUSH-303
- UPC: 757253998300
- Diameter: 0.303 inch
- Material: Polished, cryogenically treated steel
- Type: Neck Bushing
- Sizing Increments: .001 inch steps
- Compatibility: Forster Bushing Bump Neck Sizing Dies and Bushing Full Length Sizing Dies
- Country of Origin: USA
- Quantity: 1 bushing
What’s Included
- One Forster 0.303" neck bushing (BUSH-303)
Frequently Asked Questions
Which dies does the Forster .303 neck bushing fit?
This bushing is built for Forster's Bushing Bump Neck Sizing Dies and Bushing Full Length Sizing Dies. It is not compatible with Redding or L.E. Wilson bushing dies, so it needs to pair with a Forster die to work.
How do I choose the right bushing size for my brass?
Measure the neck diameter of a loaded round, then pick a bushing about .002 inch smaller than that measurement. Forster offers these in .001 inch increments, so you can fine-tune neck tension to match your brass thickness and what shoots best in your rifle.
What does the cryogenic treatment actually do for the bushing?
After heat treating, Forster runs the bushings through a cryogenic process that refines and closes up the surface of the steel. The result is a smoother bushing that reduces drag on the case neck and helps produce straighter, more consistent loaded rounds. It also adds to the durability of the part over the long haul.
Can I use the Forster die without a bushing installed?
Yes. Removing the neck bushing lets the Bushing Bump die bump the shoulder without changing the case neck diameter, which helps maintain proper headspace. It is a useful feature when you want to set shoulder position separately from neck sizing.





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