9mm Expander Thru Plug Lee – GoldPlus
Are you loading coated bullets and still finding lead deposits in your barrel? Even with perfectly adjusted Lee Precision dies and flawless bullets, leading can persist. Bullet Corp has the answer: the GoldPlus Edition Expander Thru Plug—a precision-engineered upgrade featuring a hardened core and advanced surface treatment, designed and manufactured in-house to eliminate these issues.
This simple, drop-in replacement swaps out your standard Lee Precision Expander Plug, transforming your reloading process. Compatible with Lee Precision setups, it’s tailored specifically for coated bullets—ensuring accuracy and barrel cleanliness without compromise.
Why You Need the Bullet Corp Expander Thru Plug – GoldPlus
Unlike the standard Lee expander, which only flares the case mouth, the Bullet Corp Expander Thru Plug delivers three critical functions:
✔️ Enhanced Flaring – Matches the Lee expander’s case mouth flare for reliable bullet seating.
✔️ Deeper Case Expansion – Expands the case interior just enough to perfectly accommodate .355” or .356” coated bullets, preventing damage.
✔️ Straight Seating Alignment – Guides the bullet into the case with precision, ensuring it seats straight every time.
These features protect the bullet’s coating during seating and—crucially—prevent swaging of the bullet base. Swaging, where the base is squeezed smaller than its original diameter, allows hot gases to bypass the bullet, cutting through the coating and exposing lead. This gas cutting strips away the coating’s lubricating properties, depositing lead in your barrel. The Bullet Corp Expander Thru Plug eliminates this risk, delivering cleaner bores and consistent performance.
Now with GoldPlus Upgrade
This new model features:
Reinforced Hardened Core – Resists deformation under heavy use, even with tough brass and high-volume reloading setups.
Advanced Surface Technology – A premium performance coating applied at a molecular level, improving lubricity, reducing wear, and resisting corrosion far beyond standard tool finishes.
Friction-Reducing Finish – Prevents powder fouling and eases case insertion, offering a smoother, cleaner reloading cycle.
Extreme Durability – Built to handle tens of thousands of cycles without degradation—perfect for competitive and bulk reloaders.
Seamless Integration
Designed by Bullet Corp for reloaders, this plug integrates effortlessly with your existing setup. It maintains full compatibility with powder measures like the Lee Pro Auto Disk and Auto Drum, ensuring no disruption to your workflow. Rigorous testing confirms its reliability across these systems.
Key Benefits
Prevents coating damage and base swaging, reducing gas cutting and leading
Hardened core resists wear and maintains precision for longer lifespan
Advanced surface treatment reduces friction and fouling
Ensures straight bullet seating for improved accuracy
Works with .355” and .356” coated bullets without altering powder delivery
Usage Note: For optimal results, avoid using with Factory Crimp Dies, as excessive crimping can negate the plug’s benefits. A light taper crimp is recommended instead.
Upgrade Your Reloading Today. If you’re loading coated bullets, the Bullet Corp Expander Thru Plug – GoldPlus Edition is your solution to leading woes. Designed and made in Witbank, SA, this plug pairs perfectly with your Lee Precision dies for cleaner barrels, tighter groups, and reliable performance every time.
Learn more about Bullet Corp bullets, coatings, and reloading advice on our official blog