Lee Precision 90580 Powder Through Expanding Die 9mm Luger

The Lee Precision 90580 Powder Through Expanding Die streamlines 9mm Luger reloading by combining case expansion and powder charging in a single operation. This innovative die eliminates the need for separate powder charging equipment while ensuring consistent case mouth expansion for reliable bullet seating.

What Makes This Different

Unlike traditional expanding dies that require separate powder charging steps, the Lee 90580 integrates both functions into one precise operation. The powder-through design features an internal powder reservoir that meters charges while the expander plug simultaneously opens case mouths to the correct diameter. This dual-action approach reduces reloading time by approximately 30% compared to conventional multi-step processes while maintaining consistent powder charges within +/- 0.1 grains.

Key Features

• Integrated powder charging system eliminates separate powder measure setup
• Precision-machined expander plug sized specifically for 9mm Luger cases
• Adjustable powder charge from 3.0 to 8.0 grains for most 9mm powders
• Standard 7/8-14 threading fits all major reloading presses
• Hardened steel construction with corrosion-resistant finish
• Built-in powder baffle prevents bridging and ensures consistent flow
• Compatible with both new and once-fired brass cases

The die performs reliably across various powder types, from fast-burning options like Bullseye to medium-burn rates like Unique. The internal baffle system prevents powder bridging that can cause charge weight variations, while the precision expander maintains consistent case mouth tension for uniform bullet seating. Reloaders report charge weight consistency within 0.1 grains when properly adjusted, making it suitable for both target shooting and competitive applications.

Technical Specs

• Caliber: 9mm Luger (.355 diameter)
• Thread: 7/8-14 standard reloading press threading
• Material: Hardened steel with black oxide finish
• Powder capacity: Approximately 100 charges (varies by powder type)
• Charge range: 3.0-8.0 grains (depending on powder characteristics)
• Expander diameter: .356 inches for optimal case mouth expansion
• Overall length: 3.25 inches
• Country of origin: United States

This powder-through expanding die represents proven Lee Precision engineering focused on efficiency and accuracy. The single-operation design reduces handling time while the precision manufacturing ensures consistent results across thousands of reloading cycles.