I would like to have information on 9mm win mag made by amt. Is the shells still available and who from. Is the pistol worth owning?

Well, from what I have seen before, the 9mm magnum was supposed to be a hunting cartridge for auto pistols (along with the .45 winchester mag).
Factory ammo isn't made anymore, and was probably too expensive anyway.
There's really not much it can offer over a .357 magnum revolver in my opinion.
Sounds like a collectors piece to me.

Starline still lists the brass. These guns show up occasionally. I own 2 Automags and I like them but bear in mind that they have not been made in years so part breakage could be a major problem (some parts are still available). If you are after performance you could probably get as good or better ballistics from a 1911 long slide in 9x25 or 38 Casull, however the cost would probably be much greater than a used Automag. Good luck.