This is a US Army combat shotgun marksmanship video, made in the 80's or 90's. The video shows the application, versatility, effectiveness and
training on how to wield a combat shotgun effectively on a modern battlefield.
I would have thought that only having 5 cartridges loaded at a time would be a big limiting factor, and having to stop an manually reload, instead of
using a magazine, would be slow and cumbersome under fire.