The police department logged more than 50 gunfire complaints this year through July, double the number for all of 2011, records show. Some of the complaints raised another issue. Gun enthusiasts here, as elsewhere in the country, have taken to loading their targets with an explosive called Tannerite, which detonates when bullets strike it, sending shock waves afield. A mixture of ammonium nitrate and aluminum powder, Tannerite is legal in Connecticut, but safety concerns led Maryland this year to ban it.Tannerite. Youtube is full of videos of idiots being anything but responsible with this stuff.