I get pleasure and good feedback from 1 gallon milk jugs filled with tap water. It's free, and it's a fun 300-500 yard target for an amateur like myself.
Me too! When my dad and I go out shooting on summer weekends, those are our targets of choice. When one of those goes off, you'd think that we were a couple of little kids instead of 50 and 80 years old. I guess it keeps us young!
As an added bonus, we don't have to worry about setting the forest on fire.