Hornady 300 Blackout Unprimed Brass Cases for Reloading
S118397
- Hornady 300 Blackout unprimed brass — ready to prime, charge and seat
- Designed for AR-platform rifles — uses standard .223/5.56 bolt and magazine
- Suits both subsonic and supersonic .30-calibre load development
- Tight concentricity and uniform wall thickness across every case in the lot
- Consistent internal capacity — critical in this compact, small-volume case
- Pressure calibration test during manufacture ensures uniform case expansion
- Built for multiple reloading cycles — quality Hornady brass construction
The 300 Blackout (300 AAC BLK) was designed to function in AR-platform rifles using a standard .223/5.56 bolt and magazine, simply by swapping the barrel — giving shooters access to a heavier .30-calibre projectile in a compact, suppressor-friendly package. Its short, wide case headspaces on the shoulder and is well suited to subsonic loads, where heavy bullets can be driven quietly below the sound barrier, as well as supersonic loads using lighter .30-calibre projectiles for greater range. Hornady's unprimed 300 Blackout cases allow handloaders to develop their own loads for both applications, with the quality brass foundation that accurate, pressure-consistent reloading demands. Each case is drawn to tight tolerances, with concentricity, wall thickness and internal capacity all controlled closely. The relatively small internal volume of the 300 Blackout case means that capacity consistency is critical — even small case-to-case variation can affect pressure and velocity noticeably. Hornady applies a pressure calibration test during manufacture to confirm uniform expansion, and the brass is built to last through multiple reloading cycles.
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