Lee Precision 90581 Powder Through Expanding Die 38 Special 357 Mag

The Lee Precision 90581 Powder Through Expanding Die streamlines the reloading process for 38 Special and 357 Magnum cartridges by combining case expansion and powder charging in a single operation. This precision-engineered die eliminates the need for separate powder charging steps while ensuring consistent case mouth expansion for reliable bullet seating.

What Makes This Different

Unlike standard expanding dies that require separate powder charging operations, this powder-through design integrates both functions into one efficient step. The die features Lee's proven expanding mandrel geometry that provides uniform case mouth flare while the powder flows through the center stem. This dual-action approach reduces reloading time by approximately 30% compared to traditional multi-step processes while maintaining the precise case preparation essential for accurate ammunition.

Key Features

• Powder-through design combines case expansion and powder charging operations
• Precision-machined steel construction with hardened expanding mandrel
• Compatible with Lee Auto-Drum and Perfect Powder Measures
• Adjustable expansion to accommodate various bullet diameters
• Standard 7/8-14 threading fits all major reloading presses
• Includes detailed setup instructions and load data references
• Engineered specifically for 38 Special and 357 Magnum cases

The integrated expanding mandrel creates consistent case mouth flare that prevents bullet shaving during seating while ensuring proper tension for reliable chambering. Reloaders report improved workflow efficiency in both single-stage and progressive press applications. The die's powder-through capability works seamlessly with auto-dispensing systems, making it particularly valuable for high-volume loading sessions where consistency and speed are priorities.

Technical Specs

• Caliber compatibility: 38 Special and 357 Magnum
• Thread specification: 7/8-14 TPI standard
• Construction: Heat-treated alloy steel
• Mandrel material: Hardened steel with polished finish
• Overall length: Approximately 3.5 inches
• Weight: 8 ounces
• Manufacturer: Lee Precision, USA
• Model number: 90581

This expanding die represents a practical solution for reloaders seeking to optimize their 38/357 ammunition production without compromising quality. The powder-through design eliminates handling steps while the precision mandrel ensures consistent case preparation for reliable feeding and accuracy.