Even though this question has been answered, I'd like to add the results of an actual demonstration on full sized USPSA popper targets.
These are set up at matches to fall down when hit with a single 9mm in the large circle section about 3' off the ground.
They will also go down if hit there with two to three rapidly fired .22s.
Walt Kelly, alias Pogo, sez:
“Don't take life so serious, son, it ain't nohow permanent.”