The Lyman M Expander Die #24 6mm (SKU: LY-MD24) is a precision-engineered reloading tool designed to improve the accuracy, consistency, and longevity of 6mm caliber ammunition. Operating as a purely mechanical, hand-operated tool, this die requires no electrical power and is compatible with standard reloading presses utilizing the industry-standard 7/8" x 14 thread pattern. Unlike standard expander buttons that pull through the case neck and can cause brass stretching or distortion, the Lyman M-Die employs a specialized two-step expanding process. This ensures uniform case neck tension and perfect bullet alignment, making it an essential addition to the reloading bench for popular Australian calibers such as .243 Winchester and 6mm Remington.

Key Features of the Lyman M Expander Die #24 6mm:

• Two-Step Expander Plug: The specialized plug performs two distinct operations. The first step expands the inside of the case neck to slightly under bullet diameter to establish precise, uniform neck tension. The second step expands the case mouth to bullet diameter or slightly over (approximately 1/16" deep), creating a small pocket.
• Concentric Bullet Alignment: By creating a stepped mouth, both jacketed and cast bullets sit perfectly upright and centered in the case before seating. This eliminates bullet tilt, reduces runout, and ensures the bullet seats in perfect alignment with the axis of the case neck.
• Prevents Lead and Copper Shaving: Adjusting the plug deeper provides a gentle flare to the case mouth. This is highly critical for cast lead bullet reloaders, as it prevents the sharp case mouth from shaving lead or copper plating off the projectile during seating.
• Extended Brass Life: Because the die does not stretch or work-hardens the brass neck like standard expander buttons, it significantly extends the reloadable life of your cartridge cases.

Technical Specifications:

• Manufacturer: Lyman Products
• Model / SKU: LY-MD24
• Caliber Compatibility: #24 / 6mm caliber cartridges (including .243 Winchester and 6mm Remington)
• Thread Size: Standard 7/8" x 14 threads
• Power Requirements: None (manual, mechanical operation)

Who It Is For:

The Lyman M Expander Die #24 6mm is designed for precision rifle shooters, competitive marksmen, and cast-bullet enthusiasts in Australia who demand maximum accuracy from their 6mm and .243 caliber platforms. Whether you are prepping brass for long-range hunting in the Australian bush or fine-tuning loads for target shooting, this die provides the consistency required to reduce group sizes. It is particularly beneficial for reloaders working with cast lead projectiles, as the stepped mouth prevents damage to the bullet base during seating, ensuring clean, concentric, and highly accurate handloads.