Description
If you load 40 S&W or 10mm Auto and you're tired of chasing seating depth every time you tweak a load, this Lee Precision set solves that headache. It's a four-die pistol setup that pairs a carbide full length sizing die with a micrometer bullet seating die, a powder through expanding die, and a carbide factory crimp die. The micrometer top is the star here. You dial in your number, run the case, and get the same overall length round after round. Switch bullets, log your setting, and you can return to any previous load instantly instead of starting from scratch.
What the Carbide Micrometer 4-Die Set Brings to the Bench
The carbide sizing die means no case lube on these straight-wall pistol cases, which cuts a messy step right out of your routine. Lee grinds their carbide inserts to a contour that sizes cleanly without leaving the belt-style mark you see on some other brands. The powder through expanding die flares the case mouth just enough for easy bullet starting and lets you charge with the included dipper or a powder measure, so you're expanding and dropping powder in one motion.
Why the Carbide Factory Crimp Die Matters
The fourth die is where this set earns the "deluxe" reputation. The carbide factory crimp die separates crimping from seating, which makes setup simpler and more forgiving. It also carries a carbide ring that does a finishing sizing pass on the completed round, so anything that runs through it chambers freely. That's exactly what you want when you're feeding a semi-auto and loading mixed range brass that may have been fired in other guns.
Built for the Breech Lock System
Colored quick change bushings let you lock each die to its own bushing, so you swap dies in and out without touching your adjustments. Once you've got a die dialed, it stays dialed. Note that this set also works for 10mm Auto by backing out the seating and expanding dies, and it can even be adapted to 41 Action Express. Lee has been building affordable, dependable reloading gear since 1958, and this set carries that same practical, get-it-done attitude to your loading bench.
Key Specifications
- Manufacturer: Lee Precision
- Manufacturer Part Number: 91937
- UPC: 734307919375
- Caliber: 40 S&W / 10mm Auto
- Die Count: 4-Die Set
- Sizing Die: Carbide Full Length (no case lube required)
- Seating Die: Micrometer Bullet Seating Die
- Crimp Die: Carbide Factory Crimp Die
- Mounting System: Breech Lock with Colored Quick Change Bushings
- Additional Compatibility: 41 Action Express (with adjustment)
- Shipping Weight: 1.58 lbs
What’s Included
- Carbide Full Length Sizing Die with decapper
- Powder Through Expanding Die
- Micrometer Bullet Seating Die
- Carbide Factory Crimp Die
- Colored Breech Lock quick change bushings
- Universal shell holder
- Powder dipper
- Instructions with load data
- 4-die storage case
Frequently Asked Questions
Do I need case lube with this Lee carbide micrometer die set?
No. The carbide full length sizing die handles straight-wall pistol cases without any lubricant, so you can skip that step entirely. Lee's contour-ground carbide insert also sizes cleanly without leaving the belt mark common to some other carbide dies.
What does the micrometer seating die actually do for me?
It lets you set your seating depth to a specific number and return to it exactly, even after changing bullets or loads. Instead of trial and error every time you adjust, you dial in the reading and produce the same overall length round after round. That repeatability is a big time saver if you run more than one load for these cartridges.
Can this set load 10mm Auto and not just 40 S&W?
Yes, it covers both. To switch over to 10mm Auto you back out the bullet seating die and the powder through expanding die about 1 3/4 turns. It can also be adapted for 41 Action Express, though you'll want to source separate load data for that cartridge.
What is the carbide factory crimp die for?
It separates the crimping operation from bullet seating, which makes your setup easier and more consistent. It also has a carbide ring that does a final sizing pass on the loaded round, guaranteeing your ammo chambers freely. That's especially handy with mixed range brass or cases fired in other guns.




Reviews
There are no reviews yet.