Perhaps the one bullet was fired from a worn out rifle barrel? There would have been lots of lead flying around from different directions in concentrated periods of time so certainly a real possibility of a mid air collision.wouldn't you see rifling marks on both bullets?
Son of a gun is a British term I believe. It was used to describe a boy child of a sailor that ran a cannon on the old sailing ships. The “guns” used to bring their family with them. That’s the story I have heard.Wasnt there an episode of mythbusters that looked into a 'myth' from the American civil war regarding a minie ball passing through a soldiers scrotum and carrying on to hit a woman bystander , making her pregnant thus coining the term "son of a gun"
nothing to do with the OP but an interesting story nontheless.
Ive heard that version too,and it would make more sense.Son of a gun is a British term I believe. It was used to describe a boy child of a sailor that ran a cannon on the old sailing ships. The “guns” used to bring their family with them. That’s the story I have heard.