The Redding Competition PR-50 Powder Measure (Model 03900) is a dedicated, mechanical volumetric dispensing tool engineered for reloading precision rifle cartridges. Built with a heavy-duty cast iron body, precision-ground drum, and a honed metering chamber, it eliminates internal aluminum wear parts to ensure benchrest-grade charge uniformity. The unit uses a standard 7/8"-14 threaded mounting interface for attachment to reloading presses and bench stands, and it interfaces with .22 to .50 calibre cartridge cases via the included drop tube.

Key Features

• Hemispherical Plunger Design: Features a cup-shaped micrometer plunger matching the contour of a test tube bottom, preventing powder bridging and cavity voids when throwing long-grain extruded rifle propellants.
• Anti-Backlash Micrometer: Provides precise, repeatable adjustments engineered to eliminate mechanical thread backlash across adjustments.
• Weighted Operating Handle: Utilises a rotating, weighted handle designed to maintain a uniform, smooth stroke cadence and reduce grain-shearing jolts.
• Manual Operation: Functions as a 100% mechanical reloading device, providing immunity to ambient air currents and drafts that affect electronic digital scales.

Specifications

• Model Number: 03900
• Frame Material: Cast iron body with honed metering chamber
• Mounting Thread: Standard 7/8"-14 thread
• Primary Metering Range: Approximately 35 to 75 grains (usable up to ~80 grains depending on powder density)
• Metering Sweet Spot: 50 to 60 grains
• Calibre Compatibility: .22 to .50 calibre (expandable to .17–.20 calibre with optional drop tube adapters)
• Metering Block Dimensions: Approximately 3.75 inches high by 3.0 inches wide
• Shipping Weight: Approximately 3.1 lbs (~1.4 kg)

Who is the Redding Competition PR-50 Powder Measure for?

• Precision rifle handloaders — requires consistent volumetric charges across mid-to-large capacity cartridges such as 6.5 Creedmoor, .308 Winchester, and .300 Win Mag, utilizing this benchrest rifle powder measure across its primary intended range of 35 to 75 grains.
• F-Class and benchrest competitive shooters — relies on charge-to-charge repeatability optimized around the benchrest rifle powder measure's engineering sweet spot of 50 to 60 grains, maintaining tight velocity spreads without susceptibility to environmental drafts.

Less suitable for: Handloaders dispensing charge volumes below 35 grains (which are better served by a dedicated low-volume volumetric measure like the Redding Competition 10X or BR-30) or charges exceeding 80 to 100 grains (which require a dedicated large-capacity volumetric measure like the Redding LR-1000).