I have my own range and don't want it littered with cans, bottles and other trash. But I do like to play games as much as the next guy.
I found Ice Cubes made with a bit of food coloring or koolaide make nice targets. Challenging, depending on how close or how big the ice cubes are.
But when I'm done, the ice melts, no liter, no fuss or muss.
CPT USAR Ret
USAMU Sniper School Oct '78
Distinguished Rifle Badge 1071