Frankford Arsenal M-Press vs Lee 40th Anniversary Die
By Amis Thains Updated 5 min read
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On this page (8 sections)
You are weighing a modern coaxial press against a classic O-frame combo, unsure which setup suits your bench. This page breaks down the mechanical differences, workflow speed, and true value so you can stop guessing.
In short: The Frankford M-Press is the better choice for shooters who prioritize precision, consistency, and long-term versatility. The Lee 40th Anniversary Pack is the winner for beginners or single-caliber reloaders who want an immediate, complete system. Your decision depends on whether you value high-end alignment or instant usability more.
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The guided design keeps dies aligned, giving you a stable foundation for match-grade loads.
Includes a specific die set, so you can start reloading without buying extra components.
The differences at a glance
| Feature | Frankford Arsenal M-Press | Lee 40th Anniversary Pack |
|---|---|---|
| Press Type | Coaxial single stage with guide rods | Traditional O-frame |
| Included Dies | Quick-change blocks only | Specific 3-die set (e.g., 9mm) |
| Shell Holder | Integral floating plate | Standard threaded or Breech Lock |
| Primary Use | Precision and versatile reloading | Specific cartridge or general starter kit |
| Weight | 21 lbs | Varies by model (approx. 25-30 lbs) |
Build quality and frame strength
The M-Press uses a heavy die-cast frame with two parallel guide rods. This stabilizes the shell holder, preventing flex during high-pressure operations. The mass helps dampen movement, creating a more consistent platform for resizing and seating. It feels less like a tool and more like a precision instrument on the bench. We cover m press and turret bolt fit in a guide of its own.
The Lee Challenger features a classic O-frame design. It is engineered for raw strength and rigidity. The frame resists twisting forces, which is beneficial when working with stubborn military brass. It provides a large opening for easy hand clearance, allowing you to see exactly what you are doing with the case.
For pure frame stability during precision work, the M-Press wins. For raw mechanical strength and durability, the Lee O-frame wins.
Pro tip: Always mount your press with a heavy duty clamp on a stable bench to maximize frame benefits.
The 21-pound frame provides the solid base you need for consistent alignment.
- 20" L x 9" W x 6. 5" D and weighs 21 lbs
- Integral floating shell-holder plate
Accuracy and die alignment
The M-Press uses a coaxial design. This means the shell holder stays perfectly aligned with the press centerline. This is critical for minimizing runout, which directly affects bullet concentricity and accuracy. It is the better choice for benchrest or precision rifle reloading where every thousandth of an inch matters.
The Lee O-frame relies on the press’s central axis for alignment. While very strong, it does not actively guide the shell holder like the M-Press. For general plinking or hunting ammo, this difference is rarely noticeable to the shooter.
If your goal is the tightest possible groups, the M-Press is the clear winner for accuracy potential. It actively corrects for minor misalignments that can occur in traditional presses. It helps to understand lee 90045 vs 40th anniversary before going further.
Ease of use and workflow speed
The Lee 40th Anniversary Pack often includes the Breech Lock system. This allows you to preset dies in rings and swap them in seconds. You skip the hassle of threading dies in and out of the press head. It speeds up multi-stage workflows significantly and makes caliber changes much easier.
The M-Press uses quick-change die blocks. You swap the entire block of dies rather than individual pieces. It is fast, but you must ensure all dies in the block are correctly adjusted before inserting it. This system is designed for simplicity and consistency rather than rapid switching.
For changing calibers or stages frequently, the Lee Breech Lock system wins on speed. The M-Press workflow is simpler but less flexible for quick swaps. However, the M-Press has a dedicated primer catcher, which reduces mess and handling time.
The included Breech Lock rings make swapping dies and stages much faster.
- The "O" frame press by design is the strongest and by far the most popular style press
- The larger than average 4" opening allows for maximum hand clearance
Value proposition and total cost
The Lee 40th Anniversary Pack is a complete system. You get the press and a working die set for a specific cartridge. This makes it the most immediate value for a beginner who wants to start reloading that specific round right away. You do not need to go shopping for additional components to begin.
The M-Press is sold as a press and block system. You must buy dies separately for every caliber you want to reload. While the press is a long-term investment, the upfront cost is higher because you need to source your own dies and shell holders.
It is a better value if you plan to use it for many different calibers over time. Loaders in this spot often ask about comparing dillon and frankford arsenal as well.
For the lowest barrier to entry and immediate usability, the Lee Pack wins. For long-term versatility across many calibers, the M-Press provides better value over time. Consider your future needs when deciding.
Which should you buy?
- Precision shooters: Choose the Frankford M-Press for superior alignment and consistency.
- Beginners: Choose the Lee 40th Anniversary Pack to get a complete, ready-to-use system.
- Multi-caliber reloaders: Choose the M-Press if you plan to expand into many different cartridges.
- Budget-focused: Choose the Lee Pack to avoid the extra cost of buying separate dies initially.
The bottom line
The Lee 40th Anniversary Pack is the best choice for most beginners because it is a complete, ready-to-reload system. The Frankford M-Press is better for experienced reloaders who prioritize precision and plan to use many different calibers. Start with the Lee if you want to shoot immediately; move to the M-Press when you need more consistency.
- The "O" frame press by design is the strongest and by far the most popular style press
- The larger than average 4" opening allows for maximum hand clearance
Frequently asked questions
Does the Lee 40th Anniversary Pack work with any dies?
The Lee O-frame press works with any standard threaded dies. However, the included Breech Lock system uses proprietary rings. If you buy the Anniversary Pack, you are set up for that specific die set, but you can still use standard dies if you swap the bushings.
Is the Frankford M-Press too complex for a beginner?
Not necessarily. The workflow is straightforward: load dies into the block, insert the block, and pull the handle. The main complexity is that you must buy your own dies and shell holders. If you are comfortable reading die instructions, you will manage fine.
Which press is quieter?
The M-Press is often quieter because the guided system reduces the ‘clank’ associated with O-frame presses hitting full extension. The Lee Challenger is still very quiet, but the M-Press feels more damped due to its mass and guide rods.
Can I use the M-Press for pistol reloading?
Yes, the M-Press accepts standard 7/8-14 dies, which is the standard size for almost all pistol and rifle dies. It works perfectly for pistol cartridges as long as you use the correct shell holder.