Today’s invention is a shotgun cartridge which contains a secondary charge (This charge might be radially asymmetrical).
Each cartridge could be set, before loading, so that after a given flight time, this secondary charge would ignite; causing the pellets to be scattered in a pre-determined pattern around the centre of mass of the cartridge.
The pattern could take a variety of geometrical forms -from a diffuse cloud, meant to sting but not damage a target, to an annulus, intended to punch a hole in a partition wall.