Sounds about right to me DB. I can imagine the old shellbacks saying, why would we need tha when we have swivle guns which acomplish the same thing and expell more shot.
During my research into the history of firearms the one thing which came through loud and clear was the resistance of the Horse Guards and the Admiralty to any new innovations. This was also true of foreign Powers at the time, and continued certainly up to the First World War within many departments of the War Office. I do not have enough knowledge to comment on later periods but could hazzard a guess.

Rob.