Description
The Lee Pro 4000 takes the pain out of loading revolver ammo in volume. It's a true four-station progressive, which means every pull of the handle advances the shell plate and drops a completed round in the bin. Set up from the factory for .38 Special and .357 Magnum, it handles both cartridges without any fuss since they share the same shell plate and die set. Once you get the dies dialed in and settle into a steady rhythm, several hundred rounds an hour is well within reach, which makes a serious dent in the cost of feeding a revolver or a lever gun.
What Sets the Pro 4000 Apart
The heart of this kit is the Deluxe Auto-Drum powder measure, a continuously adjustable metering system that dials in to your exact charge weight rather than approximating it with fixed discs. That's a step up you don't usually see at this price point. The press also runs Lee's Breech Lock quick-change bushing system in all four stations, so swapping dies or changing calibers down the road takes seconds once your initial setup is done. Four color-coded spline drive bushings come in the box to keep your dies locked at their settings.
Feeding and Priming the Pro 4000
The kit includes the Universal 5-Tube Case Feed Magazine to keep brass staged and moving, plus an automatic primer feed with both large and small priming arms so you're covered regardless of which primer your load calls for. Spent primers drop through the ram into a built-in disposal tube, which keeps your bench a lot cleaner than catch-cup setups. There's also a finished round bin and a hex wrench with its own storage rack for caliber changes.
Who Gets the Most Out of This Press
This is a strong move up for anyone stepping off a single-stage setup who wants real speed without jumping to a premium-priced machine. Plan on spending some time up front getting the dies and powder measure adjusted just right. Once it's tuned, the Pro 4000 runs smooth and rewards a consistent, steady pull. It's a proven workhorse for high-volume handgun loading.
Key Specifications
- Manufacturer: Lee Precision
- Manufacturer Part Number (MPN): 91557
- UPC: 734307915575
- Model: Pro 4000 Kit
- Press Type: 4-Station Progressive
- Caliber: .38 Special / .357 Magnum
- Die Set: 3-Die Carbide Set
- Powder Measure: Deluxe Auto-Drum (adjustable)
- Die System: Breech Lock quick-change, 7/8-14 thread
- Priming: Automatic primer feed, large & small arms
- Country of Origin: United States
- Shipping Weight: 13.82 lbs
What’s Included
- Lee Pro 4000 progressive press
- Lee 3-die carbide set (full-length sizing die, powder-through charging die, bullet seat and crimp die)
- .38 Special/.357 Magnum shell plate
- Universal 5-Tube Case Feed Magazine
- Deluxe Auto-Drum Powder Measure
- Automatic primer feed with large and small priming arms
- Four color-coded spline drive Breech Lock bushings
- Finished round bin
- Ergonomic wood grip roller handle
- Hex wrench with built-in storage rack
Frequently Asked Questions
Does the Lee Pro 4000 kit come set up for both .38 Special and .357 Magnum?
Yes. This kit ships from the factory configured for .38 Special and .357 Magnum, and since the two cartridges share the same case head and body diameter, the included shell plate and carbide die set handle both. You can load either one without buying extra parts.
How many rounds per hour can the Pro 4000 load?
As a true four-station progressive, it produces a finished round with every pull of the handle. Once your dies are dialed in and you find a steady rhythm, several hundred rounds an hour is realistic for handgun loads. Your actual pace depends on how smoothly you run the press.
Is the Lee Pro 4000 a good press for someone coming off a single-stage?
It's one of the most popular ways to jump into progressive loading without spending premium money. Plan to spend some time up front getting the dies and Auto-Drum powder measure adjusted, since that's where most of the learning curve lives. After it's tuned, the modular design lets you add or run automation at your own pace.
What makes the Auto-Drum powder measure better than fixed-disc systems?
The Deluxe Auto-Drum uses a continuously adjustable metering drum, so you dial in your exact target charge weight instead of settling for the closest fixed cavity. That gives you finer control over your loads and makes it easier to work across different powders and charge weights.





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