Watch a Fully Automatic Electromagnetic Pulse Rifle Demolish a Laptop Hand-held, battery powered rail gun firing steel projectiles approximately 3/8 diameter by 2 inches long at 130 fps. Great concept. Would like to see the length of projectile shortened and the increase in velocity. Not rifled, and projectiles keyholed. If he shortened the projectile to 1/2 inch length, I could see MV around 500 fps. Rifle it and then test it for range.