Description
The Hornady Lock-N-Load Auto Prime Upgrade bolts onto your existing Lock-N-Load Iron Press and swaps out the manual priming setup for a gravity-fed automatic system. Primers drop into a vertical tube at the back of the press, and when you work the handle a shuttle bar picks one up and places it dead center in the shell holder on the forward stroke. It's a small change that makes a big difference once you've got a pile of brass to get through, and it keeps your fingers off the primers so you avoid contaminating them with oil from your hands.
What the Auto Prime Upgrade Actually Does on the Bench
The real win here is being able to deprime, resize, and prime without constantly swapping tools or handling primers one at a time. The Iron Press was built to let you pause mid-cycle to chamfer, deburr, or inspect a case, and the auto prime system folds right into that workflow. Reloaders who run a lot of rifle brass like .223 and .308 tend to notice the time savings right away, and the hands-off feeding keeps things consistent round after round.
Built to Match the Iron Press
Constructed from cast iron and hard plastic, this upgrade is made to the same standard as the press it mounts to. The multi-size thread pattern and included tubes let it feed both large and small primers, so you're covered whether you're loading pistol or rifle. Everything you need to make the swap comes in the box, and installation is straightforward enough to knock out in a few minutes with basic hand tools.
Keep in mind this is an accessory, not a standalone unit. It's designed specifically for the Lock-N-Load Iron Press and won't work as a universal priming tool for other presses. If you already own the Iron Press and skipped the auto prime when you bought it, this is the piece that brings your setup up to full spec.
Key Specifications
- Manufacturer: Hornady
- Manufacturer Part Number (MPN): 085570
- UPC: 090255855708
- Product Type: Primer Feeder
- Series: Iron Press Auto Primer Upgrade
- Material: Cast Iron / Hard Plastic
- Thread Pattern: Multi-Size
- Primer Compatibility: Large and Small
- Priming Style: Gravity-Fed Automatic
- Holes: 1
- Compatibility: Hornady Lock-N-Load Iron Press
- Shipping Weight: 1.45 lbs
What’s Included
- Automatic priming system
- Large primer tube
- Small primer tube
- Large primer pick-up tube
- Small primer pick-up tube
- Primer housing tube
- Primer catch tray
- Small parts bag
Frequently Asked Questions
What press does the Lock-N-Load Auto Prime Upgrade fit?
This upgrade is built specifically for the Hornady Lock-N-Load Iron Press and converts its manual priming setup to an automatic one. It's an add-on accessory, so it won't function as a standalone priming tool or work with other presses. If you own the Iron Press without the auto prime feature, this is the part that completes it.
Does the Auto Prime Upgrade handle both large and small primers?
Yes. The kit comes with both large and small primer tubes plus matching pick-up tubes, so you can feed either size depending on what you're loading. That makes it practical for both pistol and rifle brass without needing extra parts.
How does the automatic priming system actually work?
It's a gravity-fed design. Primers sit in a vertical tube at the back of the press, and when you run the handle a shuttle bar grabs a primer and moves it to the center of the shell holder, seating it on the forward stroke. This lets you deprime, resize, and prime in one motion while keeping your fingers off the primers.
Is the Lock-N-Load Auto Prime Upgrade hard to install?
Not at all. Everything needed for the swap is included in the box, and most reloaders have it mounted and running in a few minutes. Following Hornady's instructions for aligning the shuttle will help it feed smoothly right out of the gate.




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