Description
The Lee Pro 4000 Progressive Press Kit is a four-station progressive built around the Auto Breech Lock Pro press, configured here for .45 ACP. It bundles together just about everything you need to start loading on day one, which is why plenty of folks reach for it as a first step into progressive reloading without the premium price tag of the big-name machines. With a die in every position, you place a case in the feed hole, work the lever, and each cycle turns out a loaded round.
What Comes Set Up in the Pro 4000 Kit
This .45 ACP configuration ships with a Lee Breech Lock three-die carbide set, meaning the sizing die, powder-through expanding die, and seating die are all included, along with the caliber-specific shell plate. You also get the Universal Case Feeder with five tubes, the Auto-Drum powder measure, and the Safety Prime system with both large and small priming arms so you can swap primer sizes easily. Rounding out the box are the four colored spline-drive Breech Lock bushings, an ergonomic wood-grip roller handle, a finished cartridge bin, mounting hardware, and a hex wrench with its own built-in storage rack.
How the Pro 4000 Earns Its Keep
The Auto-Drum powder measure is case-actuated, so it only dispenses a charge when a case actually rises into the expanding die. That same logic applies to priming, which keeps things safer when you are running at speed. The Breech Lock bushings let you set your die adjustments once and then pop dies in and out without losing your settings, and cartridge changeover including primer size is quick with no readjusting. Run the lever at a relaxed pace and you are looking at a few hundred rounds an hour.
One thing worth knowing: this is a capable machine, but it rewards a reloader who takes time with the initial setup. Experienced loaders tend to get the most out of it, and anyone newer will want to work through the manual and setup videos before running full tilt. You will need a scale to verify your powder charges and a solid bench to bolt it to, and after that it is ready to go.
Key Specifications
- Manufacturer: Lee Precision
- Manufacturer Part Number: 91550
- UPC: 734307915506
- Caliber: .45 ACP
- Press Type: Progressive (Auto Breech Lock Pro)
- Stations: 4
- Die Set: Lee Breech Lock 3-Die Carbide Set
- Powder Measure: Auto-Drum (case-actuated)
- Case Feeder: Universal 5-Tube Case Feeder
- Priming System: Safety Prime, large and small arms
- Color: Red / Black
- Country of Manufacture: United States
- Shipping Weight: 13.765 lbs
What’s Included
- Auto Breech Lock Pro press with 4-station tool head
- Lee Breech Lock 3-die carbide set (.45 ACP)
- Caliber-specific shell plate
- Universal Case Feeder with five tubes
- Auto-Drum powder measure with drums
- Safety Prime system (large and small priming arms)
- Four colored spline-drive Breech Lock bushings
- Spent primer discharge tube
- Ergonomic wood-grip roller handle
- Finished cartridge bin
- Mounting hardware
- Hex wrench with built-in storage rack
- Instruction booklets and product catalog
Frequently Asked Questions
Is the Lee Pro 4000 kit ready to load right out of the box?
It comes with the dies, shell plate, case feeder, powder measure, and priming system already configured for .45 ACP, so most of what you need is included. You will still want a powder scale to verify your charges and a sturdy bench to mount it to. After that initial setup, you are good to start loading.
How many rounds per hour can the Pro 4000 produce?
With a die in every station and a case dropped in the feed hole each cycle, every pull of the lever produces a finished round. Running at a relaxed pace of about ten seconds per cycle works out to roughly 360 rounds an hour. Pick up the rhythm and you can push that higher.
Can you change calibers on the Lee Pro 4000?
Yes. The Breech Lock bushings let you set your die adjustments once and swap them without losing settings, and cartridge changeover including primer size is designed to go quickly with no readjusting. You would need the correct shell plate and dies for whatever new caliber you want to run.
Is the Pro 4000 a good choice for a first progressive press?
It is an affordable way into progressive reloading and delivers solid value against pricier machines. That said, it rewards patience during the initial setup, so newer reloaders should work through the manual and setup videos before running at full speed. Experienced loaders tend to get it dialed in fastest.




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