By Hrachya H
The speed is considered hypersonic if it exceeds the Mach5 mark (5,626 fps) which basically means five times the speed of sound. In an interview given to Russian RIA Novosti news agency, Vladislav Lobaev, the founder and chief engineer of Lobaev Arms, said that they are researching the hypersonic ammunition and in case of a government […]
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Source:: The Firearm Blog