The Lee Precision 90811 Auto Drum Powder Measure is a fully mechanical, case-actuated volumetric powder dispenser engineered for handgun and rifle cartridge reloading. Mounted via standard 7/8"-14 threads directly to Lee Powder-Through Expanding Dies or Rifle Charging Dies, the unit automatically drops powder charges during the press lever stroke to prevent accidental double-charging. Built with a die-cast zinc housing, steel sector and pinion gear train, precision-molded nylon drums, and an elastomer powder wiper, the measure eliminates powder shearing with coarse stick powders while sealing against leaks when using fine ball powders.

Key Features

• Case-Actuated Operation: Automatically dispenses powder on the upstroke of the case into the die station, requiring no electrical power or 240V supply.
• Quick-Change Adjustable Drums: Comes with two infinitely adjustable drums (one small handgun drum and one large rifle drum) covering charge weights from 1 to 80 grains.
• Elastomer Wiper and Labyrinth Seal: Prevents the binding of extruded stick powders and stops fine-grained powders from leaking past the drum assembly.
• Integrated Hopper Valve: Features a built-in on/off valve and bottle adapter that fits standard 43 mm or 53 mm threaded powder containers for fast powder changes without spills.
• Wide Press Compatibility: Mounts to single-stage, turret, and progressive reloading presses using industry-standard 7/8"-14 die stations.

Specifications

• Product Model: Lee Precision 90811
• Dispensing Range: 1 to 80 grains (expandable to ~100 grains depending on powder density)
• Dispensing Tolerance: ±0.1 grain
• Mounting Interface: 7/8"-14 threads
• Item Weight: 0.5 kg (1.1 lbs)
• Package Dimensions: 20.3 × 17.3 × 9.1 cm (8.0 × 6.8 × 3.6 inches)
• Housing Material: Die-cast zinc with internal steel gear train
• Hopper Material: Chemical-resistant polypropylene with elastomer wiper
• Power Requirements: None (100% mechanical)

Who is the Lee Precision 90811 Auto-Drum Powder Measure for?

• High-volume metallic cartridge reloaders — benefits from a 100% mechanical, 0.5 kg powder measure that automates dispensing on every press stroke within a ±0.1 grain tolerance across ADI and international powder types.
• Handgun and rifle reloaders using progressive or turret presses — provides standard 7/8"-14 threads and interchangeable quick-change drums covering an adjustable range of 1 to 80 grains to switch rapidly between pistol and rifle loads.

Less suitable for: High-capacity magnum rifle loads exceeding 80 to 100 grains, which require a high-volume bench-mounted measure or dual-charging setup, and benchrest competition reloaders requiring strict 0.02-grain weight-based accuracy, who are better served by a dedicated digital scale and automatic trickler system.