Lock‑N‑Load® Concentricity Tool
Item #050076This tool identifies and eliminates bullet runout (or wobble). Just place ammunition in the tool, roll it, identify runout and use the dial indicator thumbscrew to adjust.
Features
- Universal centers ensure precise alignment of most bottleneck cartridges from 22 cal up to 45 cal.
- Easy-to-use precision adjustment knobs allow you to true up the runout on any cartridge.
- Sturdy frame can be bolted to your bench
Provides improved accuracy for handloaders, and can be used to true up factory ammo too.
Related Products

Neck Wall Thickness Gauge
Item #041223This accessory to the Concentricity Tool offers the next step in ultra-precision reloading.
Its .0005 increment dial indicator helps identify neck thickness variations so you can sort and measure case necks or verify your neck turning operation – ultimately enhancing accuracy. (Concentricity Tool not included.)
Video Library
Product Resources

How Lock-N-Load® Works
The Hornady® Lock-N-Load® System is as Easy as 1-2-3
- Insert the Lock-N-Load® die bushing into the press bushing and lock it into place with a twist. The six locking lugs on the die and press bushings will hold it securely in position.
- Insert your standard die with 7/8"-14 threads into the Lock-N-Load® bushing.
- Adjust the die to the proper position and lock your setting into the place with Hornady's unique Sure-Loc™ lock ring.
To change calibers, simply twist the die counterclockwise, remove die and insert your next preset Lock-N-Load® die and bushing. Because they remain locked in their Lock-N-Load® bushings, your dies will remain exactly as you set them. The positive locking action of the Lock-N-Load® bushings holds the dies in rock solid, perfect alignment.
Once you try Lock-N-Load® from Hornady®, you'll NEVER want to go back to your old system!
Find the right dies & accessories to complete your reloading project.
- Dies & Die Accessories
- Case Feeder Plates
- Bullet Puller Collets
- Trimmer Pilots
- Shell Holders & Shell Plates
- Primer Punch