Since the available .577/480" ammo didn't fit in the available Martini-Henry rifle when making the Great British Rates of Fire Disaster Video here: https://www.youtube.com/watch?v=Y3YiJDgddWk
... a friend of the channel who goes by the name of Stan_Da_Bout on the Army Rumour Service offered to shoot 10 rounds through his, and who were we to refuse? So we let him. And topped it off with a discussion around the initial skepticism surrounding magazine rifles at the end of the Martini-Henry era. Luckily clearer heads prevailed, and the Lee-Metford succeeded it.
Stan's earlier contribution on 303 bulleted blanks: https://www.youtube.com/watch?v=Q1zMut6vytI
Firearms history, blokesplaining firearms mechanics, mythbusting, shooting sports and kitschy sketches all in one place. An often dry and sarcastic look at whatever takes the Bloke's and the Chap's fancy in the world of guns and shooting.