Does any one manufacture case-less or shell-less shotgun ammunition (legal huntint sabots) similar to those used by a 120mm smooth bore?

I know this is probably cost prohibitive and nearly uselss, but I like looking at the engineering side of weaponry.

This type of ammo came up in talks about hunting deer with a 28' or 30" smooth bore barrel while using sabot rounds. Of course being a bunch of GIs or former GIs, our minds got to thinking...........