.50 BMG Polymer Case MK323, marketed by Engel Ballistic Research. The brass cartridge base is headstamped " B Y S 1 3 " which stands for Bay St Louis.
MAC, LLC of Bay St. Louis, Mississippi, U.S.A is the maker of the cartridge case. It not known for certain if this cartridge is loaded by MAC, LLC (MAC is the name of the company, LLC = limited liability company) or if MAC just provides empty cases to Engel Ballistic Research to load.
MAC, LLC is also the supplier to the U.S. Navy of the .50 BMG MK 323 MOD 0 Polymer/Brass lighter weight cartridge case ammunition, which looks the same as or very similar to the MK323 from Engel Ballistics Research.
Also see: http://iaaforum.org/forum3/viewtopic.php?f=8&t=18213 & http://www.dtic.mil/ndia/2012armaments/Wednesday13983stoll.pdf
Brian
MAC, LLC of Bay St. Louis, Mississippi, U.S.A is the maker of the cartridge case. It not known for certain if this cartridge is loaded by MAC, LLC (MAC is the name of the company, LLC = limited liability company) or if MAC just provides empty cases to Engel Ballistic Research to load.
MAC, LLC is also the supplier to the U.S. Navy of the .50 BMG MK 323 MOD 0 Polymer/Brass lighter weight cartridge case ammunition, which looks the same as or very similar to the MK323 from Engel Ballistics Research.
Also see: http://iaaforum.org/forum3/viewtopic.php?f=8&t=18213 & http://www.dtic.mil/ndia/2012armaments/Wednesday13983stoll.pdf
Brian
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