Hornady Lock-N-Load Ammo Concentricity Tool

Hornady Lock-N-Load Ammo Concentricity Tool lets a handloader measure bullet runout by supporting a loaded cartridge between adjustable centers and reading movement on the dial indicator. Rolling the cartridge reveals wobble that can indicate the bullet is not centered with the case axis. The tool also includes a thumbscrew adjustment system that can be used to correct measured runout rather than only identifying it.

Universal centers are designed for most bottleneck cartridges from .22 caliber through .45 caliber, giving the fixture useful coverage across a broad rifle-loading bench. Precision adjustment knobs make it possible to align the cartridge in the tool before taking a reading. The rigid frame can be bolted to the bench when a permanent measuring station is preferred.

The concentricity tool can be used to evaluate carefully assembled handloads as well as factory ammunition when the user wants to compare runout from round to round. It is most useful when paired with consistent sizing, neck preparation, bullet seating, and careful dimensional measurement rather than treated as a substitute for those steps. Browse more hunting and shooting gear for additional precision-loading tools.

• Measures bullet runout by rolling the loaded cartridge
• Adjustment system can be used to true measured runout
• Universal centers fit most .22 to .45 caliber bottleneck cartridges
• Rigid frame can be bolted to the workbench