For more than two centuries, brass has been the default material for cartridge cases, and for good reason. Since the first brass cartridge patent in 1812, brass has offered manufacturers a rare combination of formability, corrosion resistance, and consistent availability that made it the industry standard for generation after generation of shooters.
But standards can outlive the conditions that created them.
Over the last several decades, rapid industrial growth across Asia, Europe, and the Americas has placed sustained demand on copper, the primary component in brass. That demand has turned copper into a volatile commodity, and with it, the cost and supply stability of brass casings. The ripple effect has pushed manufacturers across the ammunition industry to search for alternative materials that could match brass on performance while offering more predictable economics.
On paper, alternatives like steel, stainless steel, aluminum, and titanium all look promising. In practice, each runs into the same obstacle: geometry. A cartridge case isn’t a simple shape. Wall thickness has to taper dramatically, from thin at the case mouth where the bullet seats to several times thicker at the base where the primer sits. Forming that kind of variable wall thickness out of mild steel, aluminum, or similar metals tends to work-harden the material to the point of cracking, forcing manufacturers into costly secondary operations just to produce a usable case, often with tradeoffs in corrosion resistance or brittleness that made the end product commercially impractical.
Shell Shock Technologies wasn’t the first to attempt a stainless-steel cartridge case. In the early 2000s, the U.S. Department of Defense funded research into forming a uniform-wall stainless steel case for the 7.62 cartridge. A 2007 paper by Leng and Sadowski laid out the case for a monolithic, uniform-wall stainless steel shell: lighter, less expensive, and faster to produce than brass. General Dynamics filed patents and built prototypes. But after multiple design iterations, the program was ultimately shelved: the cases suffered chronic field failures, including jamming, and manufacturing costs proved difficult to control.
That history didn’t discourage SST’s engineering team; it informed them. Rather than starting from scratch, SST’s engineers studied why the earlier stainless-steel effort failed, analyzing the specific failure mechanisms that had derailed the DoD program. That analysis became the foundation for a fundamentally more robust approach; one built not just to avoid the mistakes of the past, but to improve on cartridge case performance overall.
SST’s engineering team began development with 9mm Parabellum, one of the most widely used calibers in the world. The result of that work is NAS³™, a two-piece case built from a high-tensile nickel-stainless steel alloy, engineered to capture the advantages of stainless steel’s strength while solving the manufacturing and durability problems that had stopped earlier attempts.
By combining the best structural properties available in modern case engineering, NAS³ achieves roughly half the weight of a traditional brass case, along with meaningfully greater structural margin, smoother functioning on ejectors and breech faces, and better recovery to original dimensions after firing than steel or brass. That added structural margin is part of what allows NAS³ cases to achieve higher velocities at standard SAAMI pressures compared to traditional brass, not by pushing pressures beyond spec, but by giving handloaders and manufacturers more consistent performance within it.
The case is also more cost-efficient to produce at scale, translating into pricing stability that brass, tethered to copper markets, simply can’t offer.
Brass earned its 200-year run honestly. But the same industrial forces that made brass the obvious choice in 1812 are the ones now pushing the industry to look for what’s next. Shell Shock Technologies built NAS³ by studying where previous attempts at a stainless-steel case fell short, and engineering a solution to those specific failure points, resulting in a case that’s lighter, more consistent, and more cost-stable than the material it’s built to replace.
NAS³ is a trademark of Shell Shock Technologies. Learn more about NAS³ cases and Shell Tech™ ammunition at shellshocktechnologies.com.
