Processed 300 AAC Blackout Brass

Deprimed, Reamed, FL Resized, Trimmed, Cleaned, and Polished. Ready to Load!


Have us anneal your order. Improve case life and accuracy through more consistent neck tension.

Ballistic Advantage Authorized DealerAero Precision Authorized Dealer

Processed 300 AAC Blackout Brass

Processed 300 AAC Blackout brass is sourced from once-fired range brass of both military and commercial pedigree (to include conversions from 223 Rem to 300 BLK) and fully reconditioned to SAAMI 300 AAC Blackout specification. Under normal conditions and annealing at the proper intervals, you can expect two to six reloads per cartridge. We source brass directly from reputable indoor/outdoor ranges that do not permit reloads on their ranges which allows us to ensure true once-fired brass.  This is the brass we trust in our rifles. It works well with all platforms, including bolt actions and AR-15. This processed 300 BLK brass comes ready to reload straight out of the bag and requires no additional resizing, trimming, or swaging. We recommend a light chamfer on the case mouth to ease seating your projectiles. Our processed 300 BLK brass is also a great starting point for the reloader who wants to perform a final match prep. Keep your costs down, and save over 50% when buying our brass compared to the new Hornady brass. We fill orders to 101% (extra 10 cases per 1000) and package them in a sealed, heavy-duty, retail-quality bag perfect for long-term storage.

**This is NOT loaded ammunition**

Product Information

Brass Type

Once Fired – Commercial, Once Fired – Military, Once Fired – Processed


300 Blackout


Indoor, Outdoor


Commercial, Military

Component Type


Box Qty



Please read and understand prior to purchase

This brass is sold as USED and RECONDITIONED and may contain cartridges from various manufacturers to include commercial and military headstamps as specified in the product description.  Our processed brass undergoes a thorough and rigorous inspection to ensure a reliable and high-quality finished product.  Our process includes removing all steel and aluminum casings if present, pressure checking, depriming, reaming/swaging, roll and full-length resizing, trimming (bottleneck cartridges), and final cleaning and polishing.

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Arm or Ally is a stocking dealer for all Aero Precision, Faxon Firearms, Ballistic Advantage, HOLOSUN, Toolcraft, Elftmann Tactical, Timney, TriggerTech, HIPERFIRE and named the #1 Overall E-Commerce Dealer for Aero Precision Products in 2020!

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