The Lyman 311 Expanding Button is a precision-engineered component designed for reloaders seeking consistent case neck expansion in rifle cartridge preparation. Intended for use with compatible Lyman reloading dies, this expanding button ensures uniform case neck diameter, promoting optimal bullet seating and improved accuracy. Ideal for both novice and experienced handloaders, it is a practical accessory for those aiming to achieve reliable and repeatable results in their reloading process.
Product Overview
Manufactured by Lyman, a trusted name in reloading equipment, the 311 Expanding Button is crafted from high-quality, wear-resistant steel for long-lasting performance. Its precise dimensions are tailored to expand .30 caliber case necks to a uniform internal diameter, reducing the risk of case neck deformation and enhancing concentricity. This expander is specifically designed to replace or upgrade the expanding button in compatible Lyman rifle dies, ensuring smooth operation and minimal friction during case preparation. The robust construction supports repeated use, making it a reliable addition to any reloader’s toolkit.
Technical Specifications
| Feature |
Specification |
| Manufacturer |
Lyman |
| Model |
Lyman 311 Expanding Button |
| Product Type |
Expanding Button (Expander Plug) |
| Caliber Compatibility |
.30 caliber (typically .308–.311 diameter bullets) |
| Material |
Hardened steel |
| Finish |
Polished for reduced friction |
| Intended Use |
Case neck expansion during rifle case resizing |
| Compatible Dies |
Lyman rifle resizing dies (select models) |
| Installation |
Direct replacement for existing expander button |
| Country of Origin |
USA |
| Category |
Expanding Buttons & Decapping Pins |
Further Product Details
The Lyman 311 Expanding Button is most commonly used during the resizing stage of rifle brass reloading, where it expands the case neck to a precise internal diameter, ensuring proper bullet fit and reducing the risk of excessive neck tension. This component is compatible with select Lyman rifle resizing dies intended for .30 caliber cartridges, such as .308 Winchester, .30-06 Springfield, and similar cases. Installation is straightforward, requiring only the removal of the existing expander button and replacement with the 311 model, making it a practical upgrade or replacement part for maintaining die performance.
For optimal results and extended product life, periodic cleaning and light lubrication are recommended to prevent residue buildup and minimize wear. As with all reloading equipment, users should consult their die and press manuals for correct installation procedures and ensure compliance with all local regulations regarding reloading components, particularly in South Africa where specific guidelines may apply. Lyman offers a manufacturer’s warranty against defects in materials and workmanship, providing additional assurance for long-term reliability. This expanding button is supplied as a single unit and does not include additional accessories or dies.
