RD4590
Vortex Clipper
As in, penetrate the armor, set s fuze and explode insideWikipedia article I linked has an explanation: the shells measure travelled distance by counting their rotations and explode when reaching the desired distance. They don’t directly sense the obstacles.
That is ingenius. And in modern warfare, the sniper may be guided by drones or radar to point at the target direction. And the rifle automatically programs the shell with information provided by radar/drones/satellite via the command center server. This particular project may not succeed bur smart firearms are now becoming a thing.