This is the next piece I am going to add to my arsenal.
http://www.remtek.com/arms/imi/desert/357/index.htm
The .357 Magnum ammunition makes logistical sense.
I have a KGP-141 .357, the only problem that I have is finding stuff to feed it.
.357 and even .38 special or +P ammo is next to impossible to find down where I live. Hopefully you have a good supply in your neck of the woods, or allready on hand.