I'm not sure if this would fit here in the shotgun reloading section, but I do see slug and sabot reloads discussed quite often. If there is a better place, it can be moved as seen fit.
Whilst going down rabbit holes on YouTube last night, I came across this copper load called the gatekeeper.
https://youtu.be/NynJOLt4eTY
The damage that this can inflict is tremendous. Frightening actually if one were on the receiving end.