Bullet Corp .40 S&W Expander Thru Plug – Lee

Are you reloading .40 S&W coated bullets and experiencing leading, coating damage, or inconsistent accuracy? Even with properly adjusted Lee Precision dies and quality coated bullets, these problems can occur if the case is not expanded correctly.

The Bullet Corp .40 S&W Expander Thru Plug, designed and manufactured in-house by Bullet Corp, provides a precision-engineered solution to help protect your coated bullets during the reloading process.

This simple, drop-in replacement is designed to replace the standard expander plug in compatible Lee Precision powder-through expanding dies, providing improved case expansion and bullet alignment.

Why Choose the Bullet Corp .40 S&W Expander Thru Plug?

Unlike a standard expander that primarily flares the case mouth, the Bullet Corp Expander Thru Plug is designed to provide three important benefits:

1. Enhanced Case Mouth Flaring: Provides the necessary flare for smooth bullet seating without damaging the coating.

2. Deeper Case Expansion: Expands the case interior to better accommodate .400" and .401" diameter bullets, helping prevent excessive bullet compression during seating.

3. Improved Bullet Alignment: Helps position the bullet straight in the case, promoting more consistent seating and improved accuracy.

Prevent Bullet Swaging and Barrel Leading

One of the biggest challenges when reloading coated bullets is bullet swaging.

When the inside diameter of a cartridge case is too small, seating the bullet can compress its base, reducing the bullet's original diameter.

This can result in:

• Damage to the polymer coating.

• Gas cutting caused by hot gases escaping around the bullet.

• Increased barrel leading.

• Inconsistent accuracy and bullet performance.

The Bullet Corp .40 S&W Expander Thru Plug helps reduce these problems by providing more suitable case expansion, allowing coated bullets to be seated with less risk of damage.

Seamless Lee Precision Compatibility

Designed as a replacement for compatible Lee Precision powder-through expander plugs, our .40 S&W version maintains compatibility with Lee powder dispensing systems, including:

• Lee Pro Auto Disk

• Lee Auto Drum

This allows you to improve your case expansion without changing your existing reloading setup.

Key Benefits

• Designed specifically for .40 S&W reloading.

• Suitable for .400" and .401" diameter bullets.

• Helps prevent bullet base swaging.

• Reduces the risk of polymer coating damage.

• Promotes straighter, more consistent bullet seating.

• Helps minimise gas cutting and barrel leading.

• Compatible with supported Lee Precision powder-through expanding dies.

• Designed and manufactured by Bullet Corp in South Africa.

Important Usage Note

For best results with coated bullets, we recommend using a standard taper crimp die instead of a Lee Factory Crimp Die with a carbide sizing ring.

The carbide sizing ring in some Factory Crimp Dies can resize the loaded cartridge and potentially swage the bullet smaller inside the case, depending on brass wall thickness. This can undo the benefits of proper case expansion.

Upgrade Your .40 S&W Reloading Setup

Whether you're loading for competitive shooting, training, or general range use, the Bullet Corp .40 S&W Expander Thru Plug – Lee is designed to improve bullet seating consistency and help protect your coated bullets.

Precision-designed. Locally manufactured. Built for coated bullets.

Discover more about Bullet Corp products and reloading advice on our official blog.