Magnetic Propulsion Pellet Gun Achieves 20km/s

"Researchers at Sandia National Laboratories have used their Z Accelerator, a magnetic accelerator used in equations of state research, to accelerate pellets to speeds of about 20 km/s (about twenty times faster than a high-powered rifle bullet). Full story is here." Uses projected for this technology include simulating the impact of space junk, and, Yes, as the core of a hyper-velocity weapon.