Does anyone remember the Dardick Revolver? It fired trounds.
I have never seen one but recall reading about it.
If I remember right it was a caseless round. The propellant was solid and formed around the projectile and used electric ignition to eliminate the primer.
No litter of spent cartridge and reduces the weight of the cases for an infantryman to carry around.
The trounds were not caseless. They formed part of the chamber. It was a revolver fed from a magazine.
Fascinating concept.
https://www.thefirearmblog.com/blog/2014/03/07/dardick-model-1500-magazine-fed-revolver/