The Lee Precision Ergo-Prime Hand Priming Tool (MPN: 90250 / 90250L) is a manual, off-press reloading tool engineered to seat small and large primers into metallic rifle and pistol cartridge cases. Built with a powder-coated cast metal body, polished chrome-plated finger lever, and polymer primer trays, it replaces traditional thumb-actuated mechanisms with an ergonomic pistol-grip design. This layout maximises mechanical leverage, minimises hand fatigue, and delivers direct tactile feedback so reloaders can feel the primer seat firmly into the pocket.

Key Features

• Ergonomic Lever Design: Utilises a contoured, finger-actuated lever that distributes seating force across the hand rather than relying solely on thumb pressure.
• Safety Isolation Tray: Features a triangular primer tray that feeds standard primer packaging while isolating the active primer from the main tray reservoir to reduce the risk of chain-fire detonations.
• Dual Primer Compatibility: Includes interchangeable tray and adapter assemblies to accommodate both Small and Large pistol and rifle primers.
• Tool-Free Switching: Primer size adapters swap out directly beneath the shellholder without requiring full disassembly of the cast tool body.
• Manual Off-Press Operation: Operates 100% mechanically without power, allowing case priming independent of a reloading bench.

Specifications

• Product Type: Hand-operated priming tool
• Manufacturer Part Number (MPN): 90250 / 90250L
• Materials: Powder-coated cast metal body, chrome-plated finger lever, polymer tray assemblies
• Dimensions (Packaged): 178 mm L × 107 mm W × 61 mm H (7.0" L × 4.2" W × 2.4" H)
• Weight: Approximately 500 g (1.1 lbs)
• Tray Capacity: Up to 100 primers per load (standard commercial sleeve)
• Primer Size Compatibility: Standard Small and Large (rifle and pistol)
• Shellholder Requirement: Dedicated Lee Auto Prime Hand Priming Shellholders (sold separately; not compatible with standard press shellholders)

Who is the Lee Precision Ergo-Prime Hand Priming Tool for?

• Medium-batch hand reloaders seeking ergonomic leverage — benefits from a 100-primer capacity tray and a mechanical finger-lever design that reduces hand strain during continuous runs of 50 to 200 cases per session.
• Reloaders requiring off-press tactile primer seating sensitivity — delivers direct mechanical feedback through the hand priming tool lever across batches of 50 to 200 cases per session, ensuring consistent seating depth without bench mounting.

Less suitable for: High-volume reloaders handling runs exceeding 500 rounds per session, who are better served by bench-mounted priming tools or progressive press-integrated priming systems; reloaders priming oversized calibres exceeding hand-priming shellholder sizing (such as .50 BMG); or reloaders using Federal large primers, which cannot be loaded in full 100-count trays due to detonation sensitivity and must be fed as single primers.