Find you a 1/4 inch thick piece of steel plate,12x12 inch square is what I use. Paint it black with a white bulls eye circle.
Hang from 2 pieces of light weigh chain and go back about 20 yds or so, and listen to that .25 cal. pellet make it sing!!
With the 19.9 gr. H&N's,you hear a loud crack then "ping"!!!! The crack is from the pellet's initial hit.
The neighbors will know when you have the big gun out!
Plate shown at bottom of pic.