Lee Collet 2-die Set - .300aac Blackout

The Lee Collet 2-die Set for .300 AAC Blackout is a precision reloading system engineered for shooters who demand consistent, reliable ammunition for subsonic or tactical applications. Built by Lee Precision, a manufacturer with decades of reloading equipment expertise, this die set addresses the specific needs of .300 Blackout handloaders—a cartridge that has become essential for suppressed rifle builds, short-barrel platforms, and precision shooting disciplines. Whether you're loading for accuracy testing, duty rifle preparation, or long-range hunting, this complete two-die set delivers the fundamentals required for repeatable performance.

The .300 AAC Blackout collet die system employs a collet-and-mandrel design that applies even, concentric pressure to resize the case neck without excessive force, preserving case life and dimensional consistency across multiple reloading cycles. This two-piece die configuration includes a dead-length bullet seater die, which ensures precise cartridge overall length (COL) by measuring from the bullet tip rather than the case shoulder—critical for feeding reliability in bolt-action and semi-automatic platforms. The set ships complete with a shell holder, powder dipper for uniform charge volumes, and loading data sheets, eliminating the need for additional component purchases to begin reloading immediately.

Reloaders of .300 Blackout ammunition—from AR-15 platform shooters to bolt-gun precision rifles—benefit most from this die set's focus on neck-sizing accuracy and case integrity. The collet design is particularly valuable when working with military brass, which often exhibits tighter or irregular neck dimensions; the mandrel gently normalizes geometry without work-hardening, extending case lifespan compared to conventional sizing dies. Installation is straightforward in any standard reloading press equipped with a standard 7/8"-14 mounting thread, making this set compatible with Lee's popular single-stage presses as well as most progressive and turret reloading equipment from competing manufacturers.