Hornady Lock-N-Load Cartridge Gauge 6mm ARC Silver

The Hornady Lock-N-Load Cartridge Gauge is a precision reloading tool cut to factory SAAMI chamber dimensions for the 6mm ARC cartridge. It gives reloaders a fast, reliable way to confirm that sized cases and loaded rounds meet correct headspace and length tolerances before they are ever fired.

Machined from durable carbon steel and finished in silver, each Hornady Lock-N-Load gauge is built for long service on the reloading bench. Drop a resized and primed case (or a finished round) into the gauge: if the case seats flush with the case-head check slot, the brass is correctly sized for the chamber and ready to load. A case that refuses to seat flush signals an over-sized or under-sized piece of brass that needs correction before it is fired.

The Lock-N-Load cartridge gauge sits in the same Hornady reloading ecosystem trusted by handloaders for presses, dies, and case-prep accessories. For anyone working with the modern 6mm ARC, it is an essential bench tool for keeping brass in spec, troubleshooting tight chambering, and catching problem cases before they reach the firing line.