I don’t know the precise distance this occurs for the SS109.
I’m assured by people in the long-rang butts that the 144gn 7.62mm used to make an almighty crack as it went back through the sound barrier, louder than its normal crack. Once it’s comfortably subsonic, it will be silent, however.
The pointing the rifles at rediculous angles thing to engage the enemy in group fire was British doctrine until the 1st world war - there were dial sights (also called volley sights) on the left of the rifle which were scaled up to about 3200 yards, iirc (i’ve posted the exact figure somewhere else - search for it)[/quote]
It is ammazing, you ask a question or make a comment, get an answer, put it into the internet and get a picture.
I had no idea this was British doctine and never heard it refered to except for the franco prussian war.