Lyman Pro Series Micrometer Taper Crimp Die .40 S&W/10Mm
$92.49
The Lyman Pro Series Micrometer Taper Crimp Die for .40 S&W and 10mm gives reloaders the precision control they need to dial in consistent cartridge dimensions. Unlike standard crimp dies that offer one fixed setting, this tool features a micrometer-adjustable head that lets you fine-tune your crimp to exact tolerances—adjusting by just a few thousandths of an inch when you need to dial in the perfect fit for your loads. Whether you're working up loads for match-grade accuracy or fine-tuning ammunition for a precision pistol, this micrometer crimp die puts repeatability in your hands.
The heart of the system is a floating crimp sleeve that centers the cartridge and applies a true taper crimp—the preferred method for most centerfire pistol ammunition. The micrometer head gives you a direct, incremental way to manage crimp depth without guesswork or multiple trial-and-error rounds. This level of control is especially valuable if you're loading for multiple guns or testing different bullet weights and seating depths.
Built from corrosion-resistant stainless steel, the Pro Series die is engineered to resist rust and maintain its appearance and function through years of reloading. If you take reloading seriously and want the confidence that comes from adjustable, repeatable crimp control, this Lyman tool is a solid investment in your precision ammunition development.
Key Features
- Micrometer-adjustable head for precise, incremental crimp control
- Floating crimp sleeve centers cartridges for consistent taper crimp application
- Stainless steel construction resists corrosion and wear
- Designed for .40 S&W and 10mm ammunition
- Allows adjustment by thousandths of an inch for load refinement
Specifications
| Caliber | .40 S&W / 10mm |
| Die Type | Taper Crimp Die |
| Adjustment Type | Micrometer |
| Material | Stainless Steel |
| Brand | Lyman |
| Series | Pro Series |
Frequently Asked Questions
What is a taper crimp and why does it matter for pistol reloading?
A taper crimp gently rolls the case mouth inward at a slight angle, rather than squeezing it straight in like a roll crimp. Taper crimps are the standard for centerfire pistol ammo because they provide reliable bullet retention without over-working the case, and they work well with the typical chamber dimensions of pistols.
Can I use this die with both .40 S&W and 10mm in the same press?
Yes—this die is designed for both .40 S&W and 10mm. You can swap calibers as needed; just make sure your press and other dies in the set are also compatible with both calibers.
How much finer control does the micrometer adjustment give compared to a standard crimp die?
The micrometer head lets you adjust your crimp in small increments—as fine as a few thousandths of an inch—so you can optimize crimp depth for your specific loads, bullets, and brass without trial-and-error.
What else do I need to use this die?
This is a crimp die and works as part of a complete reloading die set for your caliber. You'll also need a compatible reloading press, and depending on your setup, a shellplate or die holder sized for this die. Check your press documentation to confirm compatibility.
