Lee Precision 90443 Case Length Gauge 300 AAC Blackout w/ Shell Holder

The Lee Precision 90443 Case Length Gauge is a precision reloading tool purpose-built for 300 AAC Blackout brass. Machined from hardened steel with a silver finish, this gauge trims fired cases to the correct length and squares the case mouth in a single, controlled pass for consistent, accurate case preparation at the reloading bench.

The 90443 sets a maximum trim length of 1.368 inches, matching the SAAMI specification for 300 Blackout cases, with a recommended trim-to range of 1.348 to 1.368 inches. Used in conjunction with the Lee Cutter and Lock Stud or Zip Trim system, the gauge delivers uniform case preparation across an entire reloading session and helps keep brass within spec for reliable feeding and consistent chamber pressure.

This unit also doubles as a dedicated shell holder, combining two bench tools into one compact, cartridge-specific piece of reloading equipment. Whether you are loading for a short-barrel rifle, suppressor host, or pistol-length carbine, the Lee 90443 is an essential bench accessory for any 300 AAC Blackout reloader looking to streamline case prep.