Description
Anybody who's run a traditional crimp die knows the hassle: loosen the lock ring, nudge the die, crank out a round, measure, repeat. Redding's Micro-Adjustable Taper Crimp Die for 40 S&W and 10mm Auto does away with all that. The knurled micrometer barrel sits right on top of the die, so you can fine-tune your crimp without ever breaking down your setup. That makes it a favorite for folks running progressive presses where space is tight and every second counts.
Why the Micrometer Barrel on This Redding Taper Crimp Die Matters
The top-mounted micrometer gives you roughly plus or minus .100 inches of on-the-fly adjustment in .001 inch increments. Case length and wall thickness vary from one piece of brass to the next, and both of those throw off your crimp. Being able to tweak the setting in fine, measured steps means you stop guessing and start getting consistent results. The die body holes are machined to tight tolerances for a close lead-in, which helps your loaded rounds keep good concentricity.
One Die, Two Cartridges: 40 S&W and 10mm Auto
The hardened steel internal crimping sleeve is double-ended, with a specific taper on each end. Flip the sleeve around and you can crimp a second cartridge with a closely related body diameter, which is why this one covers both 40 S&W and 10mm Auto. Taper crimp is the right call for these autopistol rounds since they headspace on the case mouth, where a roll crimp would cause you grief.
Fit and Setup
Like the rest of the Redding line, this die uses the industry-standard 7/8-14 thread, so it drops into any standard press or tool head. Worth noting: this is a dedicated crimping die meant for jacketed bullets, and it does the one job well. If you're loading 40 S&W or 10mm in volume and want crimp you can trust round after round, this is a serious upgrade over a basic taper crimp die.
Key Specifications
- Manufacturer: Redding
- Manufacturer Part Number: 31253
- UPC: 611760312533
- Cartridge: 40 S&W / 10mm Auto
- Die Type: Taper Crimp
- Adjustment Style: Top-mounted micrometer barrel
- Adjustment Range: Approx. +/- .100 inch in .001 inch increments
- Crimping Sleeve: Double-ended, reversible hardened steel
- Thread: 7/8-14 industry standard
- Bullet Compatibility: Jacketed bullets
- Country of Origin: United States
What’s Included
- Redding Micro-Adjustable Taper Crimp Die (40 S&W / 10mm Auto)
- Instruction sheet
Frequently Asked Questions
Does this taper crimp die work for both 40 S&W and 10mm Auto?
Yes. The internal crimping sleeve is double-ended, so you can flip it around to crimp either cartridge from the same die. Both 40 S&W and 10mm Auto share a closely related body diameter, which is why Redding pairs them in this one tool.
What's the advantage of the micrometer adjustment over a standard crimp die?
The micrometer barrel sits on top of the die, so you can adjust your crimp without pulling the die out of the press or messing with the lock ring. It gives about plus or minus .100 inch of adjustment in .001 inch increments, which makes dialing in a repeatable crimp quick and precise. That's a big time-saver on progressive presses.
Will this Redding die fit my press?
It uses the industry-standard 7/8-14 thread, so it threads into any standard single-stage, turret, or progressive press, as well as standard tool heads. No special adapter needed.
Is this a complete die set or just the crimp die?
This is a standalone taper crimp die that handles crimping only. You'll still need your sizing, expanding, and seating dies to load a complete cartridge. Plenty of reloaders add it as a dedicated crimp station to clean up and standardize their finished rounds.




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