3 ms·Ammunition is still made of metal. A gun is kind of useless without the stuff that goes boom.by fein 13y agoAmmunition is still made of metal. A gun is kind of useless without the stuff that goes boom.Pinckney 13y agoAre metal detectors we care about calibrated to detect ammunition and ammunition alone?sarvinc 13y agoI really have no idea but I've had them pick-up my belt buckle and keys before.