@rcmodel, I have a authoritative book by Sellier about gunshot wounds. In it are more than 1200 references to other peoples research. In my first 500 page book I have three references about simple issues which were too simple for me to do myself, all other material is my own.
Admittedly, there is one thing I am not sure of, and that is the early date of 608 BC for the use of fire arms. There appears to have been a massive breech block in a museum in Darmstadt. It is gone, whether the Nazis melted it down or the Allies took it, i do not know, but a written record with translation of the inscription I found published in 1886
Regards
WAH