Hornady 050076 Lock-N-Load Concentricity Gauge - Red, Multi-Caliber Precision Tool

Reloaders obsessed with precision know that bullet concentricity—how perfectly centered a projectile sits in the case—directly affects accuracy downrange. The Hornady Lock-N-Load Concentricity Gauge is a multi-caliber measuring tool designed to identify and quantify bullet runout, the radial deviation that degrades your best handloads. If you're working up loads for long-range hunting, competition shooting, or serious target work, this gauge gives you the visibility to catch and correct runout before it wastes powder, primers, and range time.

The Lock-N-Load system works by accepting loaded ammunition across multiple calibers, allowing you to roll the cartridge and visually spot runout, then reference the included dial indicator to measure it precisely. Once you've identified problem rounds, you can adjust seating to bring runout back toward zero—or simply sort out the marginal ones. It's a straightforward, hands-on approach that lets reloaders take real control of their ammunition quality.

This is a tool for handloaders who understand that consistency wins matches and fills tags. It's not essential for casual plinking loads, but if you're chasing single-digit group spreads or building match ammunition, concentricity control separates good reloading from great reloading. The multi-caliber design means one tool covers your entire cartridge lineup, keeping your reloading bench efficient and your records clean.

Key Features

• Identifies and measures bullet runout across multiple calibers
• Works with the Lock-N-Load system for compatible Hornady presses
• Includes dial indicator for precise runout measurement
• Allows you to adjust seating or sort ammunition based on runout data
• Straightforward rolling inspection method—no complex setup required

Frequently Asked Questions

What calibers does the Hornady Lock-N-Load Concentricity Gauge work with?

This is a multi-caliber tool, meaning it accommodates a range of cartridge sizes. Check your specific caliber against Hornady's compatibility chart to confirm fit.

Do I need a Hornady Lock-N-Load press to use this gauge?

The gauge is designed to work within the Lock-N-Load system. Verify compatibility with your press before purchase.

What's included in the package?

The gauge comes with a dial indicator for measuring runout. No other accessories are listed.

How do I use the concentricity gauge to improve my reloads?

Load a round, place it in the gauge, and roll it to observe any wobble. Use the dial indicator to measure the runout. If runout exceeds your tolerance, adjust the seating stem slightly and re-check, or set the round aside. Over time, you'll dial in your seating technique to consistently produce lower-runout ammunition.