Hornady Cartridge Gauge Features The Hornady Cartridge Gauge is machined to SAAMI maximum chamber tolerances giving reloaders a fast reliable way to verify that a finished cartridge will fit and function in any correctly cut chamber. Built specifically for the 6mm GT cartridge with a .243 bullet diameter it serves as a case length headspace and comparator gauge in one simple tool. Checking cases and loaded rounds against this gauge before heading to the range helps prevent chambering issues that can slow down a shooting session or a hunt. Its precise machining reflects Hornady s reputation for accuracy-focused reloading equipment. This gauge is a practical addition to any 6mm GT reloading bench whether for competition shooters chasing tight tolerances or hunters who want dependable feeding in the field. Using a dedicated cartridge gauge as part of a regular reloading workflow catches sizing or seating errors before they become a problem downstream. Compact and simple to use it requires no special tools or setup to check a batch of finished ammunition. For 6mm GT shooters who demand consistency from every loaded round the Hornady Cartridge Gauge is a straightforward dependable quality control tool. Hornady Cartridge Gauge Specifications Manufacturer: Hornady Type: Case Length / Headspace Gauge / Comparator Caliber: 6mm GT Bullet Diameter: .243 Available At: GrabAGun