The Us navy is set to test out the first rail gun. The idea of a rail gun was only thought about in science fiction but it is very possible. The amount of money a rail gun would save is immense. The average projectile cost is $25,000 while a regular middle is about $500,000
http://www.nbcnews.com/science/science-news/not-science-fiction-navy-test-futuristic-gun-sea-2016-n74166
