“Just when you thought we’d nailed the art of firing chunks of metal at each other at immense speeds,” dailymail.co.uk snarks, “a US weapons firm has shown it can do it faster. An electromagnetic railgun has been tested firing bullets at Mach 6 – six times the speed of sound. Designed by San Diego-based General Atomics Electromagnetic Systems (GA-EMS), the Blitzer railgun uses electromagnets to send its projectiles hurtling off at thousands of miles per hour.” That would be six times the speed of sound. The main advantages over traditional explosives are stated as improved safety – due to less explosives on board – and could drastically reduce the costs.” Reduced costs. Sure.