the army program you are referring to was called quick kill.I used to shoot pennies in the air with my BB gun. I would throw a penny in the air and hit it (sometimes). I got the idea back in the 60s from what I remember was an Army program. My neighbor and I had a lot of fun then. I don't remember how many I could hit.
A couple of years ago, I tried it with my Daisy 880 and would hit about 1 in 10 to 1 in 15. Good exercise with a pump BB gun. I have some dented pennies around here somewhere. Like everything you get better with practice.
Wear eye protection.