Redding #20 Standard Bullet Seating Micrometer

The Redding #20 Standard Bullet Seating Micrometer is a precision reloading tool that transforms your existing seating die into a competition-grade setup. If you're serious about hand-loading ammunition and want to dial in bullet seating depth to exacting tolerances—we're talking 1/1000th of an inch repeatability—this micrometer upgrade gives you that level of control without replacing your entire die. It's designed to work with any seating die that uses a standard ½-20 threaded seat plug, making it a practical way to upgrade gear you already own.

Competitive shooters and precision handloaders choose Redding micrometers because the difference between "good enough" and "record-setting" often comes down to consistency. By replacing your standard seating plug with this micrometer, you'll have the ability to measure and repeat your seating depths across every round. That kind of precision pays off on the range and in the field—tighter groups start with ammunition that performs exactly the same shot to shot.

The #20 designation corresponds to a specific seat plug thread size, so verify your current die's plug matches before ordering. Once you confirm compatibility, swapping between this micrometer and conventional seat plugs is straightforward, letting you move the micrometer between dies as needed. It's the kind of tool that serious reloaders keep in their kit because it solves a real problem: how to verify and hold identical seating depths without guesswork.

Key Features

• Micrometer-driven bullet seating depth adjustment for precision control
• Delivers repeatable seating accuracy to 1/1000th of an inch
• Converts standard seating dies to competition-grade setup
• Compatible with all seating dies using ½-20 threaded seat plugs
• Interchangeable between dies—purchase once, use across your setup

Specifications

Frequently Asked Questions

Will this micrometer fit my seating die?

The #20 designation matches a specific seat plug thread size. Check the number on your current seating plug—if it's marked #20, this micrometer will work. Redding offers other numbered versions for different plug sizes, so verify compatibility before purchasing.

Can I use this micrometer on multiple dies?

Yes. Since the micrometer screws onto any seating die with a ½-20 threaded seat plug, you can swap it between different dies. Simply unscrew it from one die and install it on another.

What's the advantage of a seating micrometer for handloaders?

A seating micrometer lets you measure bullet seating depth to 1/1000th of an inch and repeat that depth consistently across every round you load. This precision directly improves ammunition consistency and accuracy potential—critical for competitive shooting and precision rifle work.