Last reviewed: 2026-04-17 by Jake Terry, FFL07/SOT3 holder, NRA-certified firearms instructor.
New unprimed 6mm ARC brass arrives ready for the loading bench. The 6mm Advanced Rifle Cartridge—developed to deliver superior ballistic coefficient and energy retention—requires precision-manufactured cases to maintain the tight tolerances that define the platform. Each case is produced with consistent wall concentricity and tested under pressure calibration to ensure uniform expansion in the chamber. For reloaders chasing sub-MOA groups at extended range, case quality dictates seating depth consistency and charge uniformity, which translate directly to velocity spread and point-of-impact repeatability. This brass is sold new and unprimed, accepting small rifle primers in standard pocket diameter. Fifty cases per box, manufactured in the United States, ready for sizing, charging, and seating after light preparation.
Built for the Box
Production brass undergoes a final tumbling wash after the case mouth annealing cycle. Some case mouths may arrive slightly out-of-round or show minor dents below the shoulder—cosmetic imperfections that resolve during the first firing and do not affect case life or performance. Anneal stain may remain visible on non-plated brass, appearing as a pinkish tint at the neck. Smaller-caliber cases occasionally exhibit slight bell at the mouth. Standard preparation protocol: run each case partway into the sizing die to straighten the mouth, lubricate the neck interior to prevent stretching during expander-ball passage, then chamfer and debur inside and out. This takes minutes and ensures consistent neck tension and smooth bullet seating. New brass from United States production facilities, boxed in quantities of 50, with a shipping weight of 0.850 pounds per box.
Specs at a Glance
| Spec | Value |
|---|---|
| Cartridge | 6mm Advanced Rifle Cartridge (6mm ARC) |
| Finish | Brass |
| Condition | New |
| Quantity | 50 Piece |
| Configuration | Box of 50 |
| Primed | No |
| Primer Size | Small Rifle |
| Country of Origin | United States of America |
| Shipping Weight | 0.850 Pounds |
The 6mm ARC platform was designed to maximize ballistic efficiency in compact gas-gun packages, and case quality is non-negotiable for extracting that performance. For the full catalog of reloading components and precision rifle accessories, browse our Reloading Brass section.
Safe Handling & Compliance
This product contains lead, a substance known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov. Federal law requires purchasers to be at least 18 years old for rifle ammunition components. Store brass and primers in a cool, dry location away from heat sources and out of reach of unauthorized users.
- Observe the four universal rules of firearms safety when handling any ammunition component or assembled cartridge
- Verify current federal, state, and local laws governing ammunition component possession and use in your jurisdiction before ordering
- Lubricate case necks during sizing operations to prevent excessive stretching and maintain consistent neck tension
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