<prompt> Keyhole bullet entry is a feature of -Tandem bulletRicochet bulletSingle bulletDouble bullet  <response>: the synopsis of forensic medicine toxicology ; Dr k.s narayan reddy ;28th edition ; pg.no 134 A ricochet bullet is one in which before striking the object aimed at ,strikes some intervening object first then after rebounding from these hits the object. Sometimes a bullet may strike an object tumble hit the body side on ,producing an elongated wound of entrance like a keyhole . 