The Lee Precision 90700 Auto Bench Prime is a dedicated, bench-mounted mechanical priming tool designed to seat Boxer-type primers into rifle and pistol cartridge cases. Operating entirely without external electrical power, the unit isolates the priming step from the reloading press to streamline batch case preparation. It utilizes a symmetrical, ambidextrous lever linkage that delivers mechanical leverage to seat primers securely while retaining precise tactile feedback as the primer bottoms out in the pocket. The system features a transparent polyester elevator track for visual feed monitoring and a textured folding tray capable of holding standard packaging trays directly from the box.

Key Features

• Dedicated Off-Press Priming: Moves primer seating away from the main press to streamline single-stage and batch case preparation.
• Dual Primer Size Compatibility: Includes separate priming assemblies to seat both small and large Boxer primers for rifle and pistol calibres.
• Direct-Feed Folding Tray: Built-in textured surface flips primers upright from manufacturer packaging and holds standard bulk packs for continuous flow.
• Ambidextrous Mechanical Linkage: Symmetrical lever design allows smooth, low-effort operation using either the left or right hand.
• Visual Inspection Elevator: Water-clear polymer feed track allows the operator to verify primer orientation and flow before seating.
• Dedicated Shell Holder System: Engineered exclusively for flat-bottom Lee Auto Prime / Priming Tool shell holders (not compatible with standard universal press-mounted shell holders).

Product Specifications

• Product Type: Bench-mounted reloading priming tool
• Model Number: 90700
• Operation: Manual mechanical lever (no 240V power required)
• Packaged Weight: Approximately 0.45 kg to 0.50 kg (1.0 to 1.1 lbs)
• Tray Capacity: 100 primers (standard manufacturer tray pack)
• Mounting Hardware: Includes two 1/4"-20 bolts and nuts (also compatible with the Lee Bench Plate System #90251)
• Primer Compatibility: Small and Large Boxer-type rifle and pistol primers (Federal brand large primers must be fed one at a time)

Who is the Lee Precision Auto Bench Prime for?

• Precision rifle reloaders seeking benchtop tactile feedback — secures rigidly to the reloading bench using the included two 1/4"-20 bolts/nuts hardware to provide consistent mechanical feel when seating primers to exact pocket depth across a 0.45–0.50 kg unit footprint.
• Handloaders experiencing hand fatigue from handheld squeeze primers — replaces continuous grip squeezing with a smooth bench-mounted lever and a 100 primers tray capacity to process large cartridge batches with minimal finger strain.

Less suitable for: Handloaders who need portable priming capability away from a fixed workbench (who are better served by compact handheld squeeze-priming tools), reloaders seeking continuous progressive automation (who require automated on-press priming systems), or users bulk-loading Federal brand large primers, which must be single-fed one at a time rather than tray-loaded due to safety requirements.