I read a story, "Maybe" true, probably not that once one of the testing organizations that did exactly these sorts of tests used to use frozen chickens from the supermarket. They would load the air-cannon the night before the test, then in the morning the chicken would be defrosted and they were ready to go.

However one morning the test results were rather more "messy" than they were expecting. They had no clue what had gone wrong, so they reviewed the high-speed footage to see the chicken leave the barrel along with a stray cat that had been chewing on it when the cannon fired...