The new SOST round from Federal Cartridge was engineered for the United States Marine Corps as a supplemental/replacement round to M855 green tip with more desirable terminal characteristics. NSN # 1305-01-573-2229, designated as the MK318 MOD-0, this round was designed as a “barrier blind” round and has superior penetration and better ballistic stability when shooting through glass, car doors, and other barriers where lesser rounds might be deflected. It was engineered after the Marine Corp identified barrier penetration issues with the M855 round. This new round utilizes a 62 grain open tip boat tail hollow point bullet with a lead core and reverse drawn copper jacket that creates an open tip.
From the press release from ATK:
MINNEAPOLIS, MN — Alliant Techsystems (ATK) announced today that it has received a $49 million contract from the U.S. Navy to produce a new special operations ammunition round with improved accuracy, stronger barrier penetration, and a lower muzzle-flash. ATK Security and Sporting developed the round in partnership with the Naval Surface Warfare Center – Crane Division under the Special Operations Science and Technology (SOST) ammunition program.
The SOST ammunition will be manufactured in 5.56x45mm and 7.62x51mm calibers, and is short-barrel optimized. It is designed for use with the MK16 and MK17 Special Operations Combat Assault Rifle Weapon System. Production will be performed at ATK’s Federal Premium Ammunition plant in Anoka, MN. Deliveries are expected to be completed in 2015.
“ATK is the clear leader in developing new ammunition technologies for commercial use,” said Ron Johnson, President of ATK’s Security and Sporting group. “We are now applying our research and development capability to satisfy the needs of our special operation forces.”
The new SOST 5.56mm and 7.62mm ammunition adds to ATK’s portfolio of specialized ammunition, including long-range products for both law enforcement and military applications.
ATK is an aerospace, defense, and commercial products company with operations in 24 states, Puerto Rico, and internationally, and revenues of approximately $4.8 billion. News and information can be found on the Internet at www.atk.com.