Lyman 300 AAC Blackout Case Length Headspace Gauge

The Lyman 300 AAC Blackout Case Length/Headspace Gauge is a precision reloading tool purpose-built to verify the critical case length and headspace dimensions of 300 AAC Blackout brass. Machined from steel to exacting SAAMI specifications, this one-piece, non-adjustable cylinder-type gauge provides a reliable go/no-go check, allowing the handloader to confirm that cases are within safe and consistent dimensional limits before reloading.

Proper case length and headspace measurement is essential for safe, accurate reloading. Out-of-spec brass can lead to feeding issues, inconsistent ignition, and pressure variations. The Lyman gauge makes it fast and easy to inspect trimmed cases for uniform length and correct case head positioning relative to the chamber, catching problems before they ever reach the press.

Designed specifically for the 300 AAC Blackout cartridge, this gauge is a must-have for any reloading bench working with this versatile caliber. Its compact, rugged steel construction stands up to regular bench use and stores easily in a reloading toolbox, ready to deploy whenever cases need to be checked.