The Immortal Heart(1939)

Nuremberg durting the time of Albrecht Durer and the famous geographer Martin Behaim: the locksmith Peter Henlein is looking for a way to make bullets more accurate by designing a new form. Just as he welds together two round balls into an elongated shape, he believes he's discovered that his assistant Konrad is trying to alienate his wife from him. There is a struggle, during which Henlein's new kind of bullet strikes him in the chest. The doctor, unaware that there are two bullets lodged in his body, because there was only one shot, only removes one.