SIG Headstamped .338 Norma Mag Cartridges And New SIG MG Being Tested/Certified By USSOCOM

Part of a news release from SIG:

SIG SAUER, Inc. is pleased to announce the United States Special Operation Command (USSOCOM), working closely with SIG SAUER, has completed a safety certification of the new SIG SAUER MG 338 Machine Gun, SIG SAUER 338 Norma Mag Ammunition, and Next Generation Suppressors. Following this historic official safety certification, SIG SAUER has completed deliveries of multiple systems, comprised of the MG 338 Machine Guns, 338 Norma Mag Ammunition, and Next Generation Suppressors – all researched, designed, engineered, and manufactured by SIG SAUER in the U.S.A."

More information here:

Screen shots showing SIG .338 NM ammunition in belts, from a YouTube video (video can be accessed via the above listed webpage):

SIG .338 Norma Mag in MG Belt, c


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SIG .338 NM headstamped brass case:

SIG .338 NM Headstamp

Early on it appears that SIG was trying/using polymer/metal composite cased cartridges:

This composite case looks like the those made by PCP Ammunition, PCP made .338 NM shown below:

PCP .338 NM Composite Case

It appears SIG is still using or at least mentioning a polymer composite case for the .338 NM. Photo shown below was posted on Military Guns and Ammunition (Tony Williams forum) by member “gatnerd” who took a photo of the SIG display at Shot Show 2020: