How about making some ballistics gel? Or get some potatoes or any other fruit. If it looks cool in real speed when you shoot it, imagine looking at a bullet exploding a tomato or potato or whatever else in slow-mo? That would be pretty sweet. Also, try shooting at some steak or pork slabs, some electronics, some metal cans, a full can of beef stew or something, paintballs, little ceramic tiles, plastic water jugs, watermelons, man the list of fun things to shoot is endless! Also, that camera would be great for finding any flaws in shooting stance or technique.