The Hornady Pistol Rotor & Metering Assembly (MPN 050128) is a dedicated pistol powder measure rotor assembly precision-machined from solid steel. Designed specifically for the standard Hornady Lock-N-Load Powder Measure and Lock-N-Load AP progressive press, it integrates a narrow-bore, small-diameter chamber engineered to drop uniform low-volume powder charges without bridging. The assembly utilizes Hornady's push-button quick-change insert system, enabling handloaders to swap metering inserts rapidly while retaining set charge depths. It functions best with ball, spherical, and fine granulated powders, and is also compatible with the optional Hornady Handgun Micrometer Metering Insert (#050129).

• Precise Low-Volume Dispensing: Features a narrow-bore metering chamber engineered specifically to prevent bridging and shot-to-shot variance during low-grain drops.
• Push-Button Interchangeability: Integrates directly with the Hornady quick-change system to swap metering inserts instantly without losing set charge measurements.
• All-Steel Construction: Precision machined from durable steel to withstand continuous bench-mounted use on progressive or single-stage presses.
• Manual Operation: Fully mechanical assembly requiring no electrical current, motor, or external power.

Specifications

• Model / MPN: 050128
• Category: Pistol powder measure rotor assembly
• Material: Precision machined steel
• Charge Capacity Range: 0.5 grains to 17.0 grains
• Minimum Functional Drop Rating: 0.5 grains
• Maximum Internal Volumetric Capacity: 17.0 grains
• Weight: Approximately 1.33 to 1.38 lbs (~600–625 g)
• Package Dimensions: 4.75″ L × 3.25″ W × 2.25″ H (approx. 12.1 × 8.3 × 5.7 cm)
• Interface Compatibility: Standard Hornady Lock-N-Load Powder Measure, Lock-N-Load AP progressive press, and Handgun Micrometer Metering Insert (#050129). Not compatible with Bench Rest Grade or Black Powder measures.

Who is the Hornady Pistol Rotor & Metering Assembly for?

• IPSC and practical pistol competitors loading 9mm or .45 ACP on progressive presses — requires the Hornady Pistol Rotor & Metering Assembly to meter precise charges within its calibrated 0.5 grains to 17.0 grains charge capacity range, ensuring uniform sub-grain powder drops at high production volumes.
• Target shooters handloading small-capacity rifle and handgun cartridges locally — relies on this pistol powder measure rotor assembly for its 0.5 grains minimum functional volumetric drop rating, which eliminates charge bridging when throwing ultra-light, small-capacity target recipes.

Less suitable for: Reloaders dispensing powder charges exceeding the 17.0 grains maximum volumetric limit, who require a standard rifle rotor assembly or high-capacity rifle powder measure designed for larger powder volumes.