I save my plastic milk jugs and take them to the range. Fill them with water from the faucet at the range and leave off the lids. My grandchildren and myself regularly hit them at 50 yards. You know you hit it because of the fountain you get when you hit one. You should have seen my grandson's face the first time he hit a water jug with a 45ACP. To heck with the gong put out a water jug.
"The historical cycle seems to be: From bondage to spiritual faith; from spiritual faith to courage; from courage to liberty; from liberty to abundance; from abundance to selfishness; from selfishness to apathy; from apathy to dependency; and from dependency back to bondage once more."
Henning Webb Prentis Jr - 1943