Hrndy Lnl Ammo Concentricity Tool

The Hornady Linear Ammo Concentricity Tool is a precision measurement and correction device designed for serious handloaders seeking match-grade ammunition consistency. This tool identifies and eliminates bullet runout—the lateral wobble that degrades downrange accuracy—by measuring concentricity with dial-indicator precision and allowing systematic adjustment until rounds meet specification.

The concentricity tool features a dial indicator thumbscrew mechanism that provides real-time feedback as you rotate loaded rounds through the measuring chamber. This allows detection of runout in the thousandths of an inch—variations that compound across a magazine or magazine tube and translate directly to group size degradation at distance. The sturdy frame bolts securely to a reloading bench, eliminating hand-holding variables and ensuring repeatable measurements shot-to-shot. Weighing 3.94 lbs with compact dimensions (6.12 × 4.75 × 13 inches), the tool occupies minimal bench space while providing the rigidity required for consistent dial readings.

This tool serves competitive shooters, precision rifle builders, and dedicated handloaders who understand that ammunition quality directly controls achievable accuracy. It addresses a specific weakness in factory ammunition and amateur reloading: runout accumulation that goes undetected until downrange performance reveals the problem. By catching and correcting runout before rounds leave the shop, users eliminate one major variable from accuracy equations—critical for long-range hunting, competition stages, and precision shooting where tight groups determine success.

Hornady's reloading division builds tools around the principle that consistency and quality control define safe, accurate handloading. The concentricity tool reflects this commitment by offering accessible runout measurement and correction to operators who otherwise lack the equipment to verify ammunition uniformity before relying on it in the field.