A colleague of mine at a university I work at is conducting research for protective structures. They currently have a .308 rifle and reloading equipment to test armor materials, but they are looking to conduct tests with a projectile traveling in the 50 - 100 feet per second range. Knowing that I'm a shooter and reloader they asked me if I thought that this was possible. I don't know, so I'm turning to you all for advice. My guess is that it would be a very fine line between getting a projectile with those types of velocities and getting a bullet stuck in the bore. I'm thinking that they might be better off with a cross bow or something. They've got some budget, but probably not enough to do things properly and build a gas gun. Any ideas or suggestions?