Shotgun dies?

[COLTIMPALA]

I guess the title speaks for itself. I'm familiar with how a MEC works, or a Loadall. But why are shotgun dies not a thing? Or were they? The reason I ask is because I came across this press some time ago and it looks like maybe that was the idea for it?
Anyone have comments here or care to elaborate on what the deal is with this press? I'm very familiar with reloading pistol/rifle, but not to much on shotguns.

 

[Charlie]

That looks like a sizer for the brass at the base of a shotgun shell. Some presses do not have sizers, and you must use something like this to resize the bases.

 

[Charlie R]

I don't think is a reloader at all. It looks like a bullet sizer/lubricator for cast bullets.

 

[Dan]

Had one sold it. It is a sizer only press. I had 20 and 12 gauge, inserts. It was useful for reloading back when a lot of loaders did not size the base at all.

 

[Ticket Machine]

I still have one. The MEC 650 progressive press didn't size and this collet sizer was a must. I remember RCBS made shotgun dies that screwed into the metallic presses like the Rock Chucker. But first you had to take out the insert in the top of the press for the 7/8 x 14 thread. I would imagine it would take a long time to load a box of shells with that setup.