The other oddball thing with Britain trying so hard to reduce recoil with the Boys, was their take on first generation shaped charge anti-tank weapons. When everyone else was going with recoilless weapons, the Brits came up with a shaped charge spigot mortar, the PIAT, whose recoil would knock your fillings out.
The Boys looked painful to fire. And the PIAT was just as bad but you could knock a panzer out with a lucky shot.