If I had to guess then I would say that Fort Scott might not have been satisfied with projectile stability of solid copper when loaded into the stiff SST cases. I had noticed that some of the American Reserve “Counterstrike” EHP monolithic copper bullets were not seated at the same depth, and some of them were loose in the SST cases they used. I wonder if the SST cases are conducive to monolithic solid copper bullets in general when being seated in place?
They also started manufacturing a case with a “plain aluminum” (edit: tri-valent chrome) base and standard S3 9MM LUGER headstamp around August 2020. This year this same case is also found with a new S4 9MM LUGER headstamp.
Xts, Inc. (dba “Armorup”) (S3 9MM LUGER -tri-valent chrome-).
Update on the new base coating mentioned above as “plain aluminum”:
“Initially Shell Shock used electroless-nickel plating to coat our aluminum bases. Electroless nickel plating provided the required protection, but was not a scalable process as demand for NAS³ cases increased. To cope with the spike in demand that occurred during 2020, we switched to a different method of coating the aluminum bases: tri-valent chrome”.
If someone has the time it would be great if they expanded it to enter the names of companies, if known, who used the various headstamps! any other information, like DKs on the G9 hst would also be a useful note. If you are interested, I can email you a word document with this list.
The S3 headstamps with a lower case letter added identify companies who manufactured NAS3 cases for SST under cpntract.
AP RS is Alsa Pro s.r.o, Czech Republic. Loaded Shell Shock Technologies ammunition for a shooter named Robin Sebo.
NOVX: Timberghost Tactical, LLC, Calhoun, GA, USA.
New manufacturer as of Fall 2017. Make revolver/ Pistol specialty NaS3 rounds with stainless steel casings. Novx is a brand of theirs.
BWA is Blackwater Ammunition, Mellieha, Malta
(PBM Ltd.). Manufacturer of Ammunition, bullets and military gear for the civilian market. Started producing ammunition in 2018. Currently offers calibers in 9mm Luger, .45 ACP, .223 Remington, .308 Winchester and .50 BMG and new 10x100mm cartridge. Some cases they have are using Shell Shock Technologies S3 casings. www.blackwaterammo.com
C3: Chesapeake Cartridge Corp., Richburg, SC, USA. Newer ammunition company established in 2009, using cases by Shell Shock Technologies.
S3, S3F, S4, SST all shell shock themselves. I suspect S3s, S3g and S3a, S3 st, S3 a, S3 cm, S3h also by shellshock representing some change to the plating or similar.
SMAC: Hailey Ordnance Co., Oklahoma City, OK, USA. Cartridge headstamp letters are for Seismic Ammunition Company. Unsure of the relationship between these two companies at this moment. Cases made by Shell Shock Technologies.
G9 Bullets & Ammunition, Lakewood, CO, USA. Business started in 2014. Manufactures specialty bullets and has some cartridges loaded using Starline Brass and some with Shell Shock Technology cases. As of Jan 1, 2020, their web site does not work. There appears to be some working relationship between G9 and American Reserve Munitions (ARM) as headstamps from each company are often intermixed in boxes. Note: their web site also does not work.
AA is Anderson Arms
made by Shell Shock Technologies, Westport, CT, USA.