Description
If you're running a Forster Bushing Bump Neck Sizing Die or a Bushing Full Length Sizing Die, the 0.301" neck bushing is how you fine-tune neck tension to match your brass and your load. Instead of relying on a one-size-fits-all expander, the bushing itself sets your inside neck diameter, so you get to decide exactly how much grip your bullets have. That kind of control is what separates a decent reload from one that shoots tiny groups.
What the 0.301" Forster Bushing Does on the Bench
This bushing honed to a precise 0.301" inside diameter, and Forster offers them in 0.001" steps so you can nudge neck tension up or down without guessing. The general rule is to pick a bushing roughly 0.002" smaller than a loaded round measures at the case neck, then adjust from there for more or less bullet grip. Since the bushing controls sizing rather than the chamber, it works off the actual wall thickness of your brass, which is a big part of why this system delivers such repeatable tension.
Why the Cryo Treatment on This Neck Bushing Matters
Forster heat treats and hones every bushing, then runs it through a super-cooling cryogenic process. That treatment refines and tightens the steel's surface, giving you that smooth-as-silk feel when the case neck passes through. A slicker bushing means less drag, less brass distortion, and better concentricity on the loaded round. It also means the bushing shrugs off wear, so it holds its spec through high round counts.
Fitting the BUSH-301 Into Your Setup
Drop-in simple. The bushing seats chamfered side down in the top of the die body, floating slightly so it self-aligns to the case neck. Keep in mind these are built specifically for Forster dies and are not cross-compatible with Redding or L.E. Wilson bushings. If you already shoot a Forster bushing die, this is a quick way to tune in a new caliber or chase tighter groups with brass you've already been reloading.
Key Specifications
- Manufacturer: Forster Products
- Manufacturer Part Number: BUSH-301
- UPC: 757253998324
- Inside Diameter: 0.301"
- Type: Neck Sizing Bushing
- Material: Cryogenically treated, heat treated steel
- Sizing Increments Available: 0.001"
- Compatibility: Forster Bushing Bump Neck Sizing Dies and Bushing Full Length Sizing Dies
- Quantity: 1 bushing
- Country of Origin: USA
What’s Included
- One Forster 0.301" neck bushing (BUSH-301)
Frequently Asked Questions
Which dies does the Forster 0.301" neck bushing work with?
It's designed for Forster Bushing Bump Neck Sizing Dies and Forster Bushing Full Length Sizing Dies. These bushings are specific to Forster's system and will not interchange with Redding or L.E. Wilson bushings, so make sure you're running a Forster die before ordering.
How do I know if the 0.301" is the right bushing size for my load?
Measure the outside neck diameter of a few loaded cartridges, then subtract about 0.002" to find your bushing number. For more bullet grip you can subtract 0.003" instead. Since Forster offers bushings in 0.001" steps, it's easy to grab a size up or down if you want to tweak your neck tension.
What does the cryogenic treatment actually do for the bushing?
After heat treating and honing, Forster runs the bushings through a cryogenic process that refines and closes the steel's surface. The result is a smoother bushing that produces less drag and better loaded-round concentricity. It also adds durability so the bushing holds its dimension over a lot of cases.
Does the 0.301" bushing come with a die?
No, this is a single standalone bushing sold on its own. Forster neck bushings are purchased separately from the dies so you can build out the exact sizes your calibers and brass call for. If you don't already own a Forster bushing die, you'll need one to use it.





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