I was thinking A close proximity scaled off of a modern reproduction with conversion cylinder might fire the 40mm grenade
modern reproduction with conversion cylinder 45 cal.
40mm grenade 1.57" cal.
But actually it turns out to be 28mm 1.1"cal. so I was off by 12mm even Nasa was off by more than that once.
https://www.guinnessworldrecords.com...%281.1%20in%29.
Bookmarks