Wildey Moore put together some big-bore auto pistols in .45 Magnum, 44 Auto Mag, 45 Wildey Magnum and 475 Wildey Magnum. He designed the basic gun in response to a request from an unnamed government agency. These are pretty beefy, gas-operated pistols and the only ammo I've seen on a store shelf is the .45 Win Mag. I suspect most Wildey buyers are motivated enough to buy the reloading dies (and brass?) along with the guns. CA-compliant? I doubt it.
I met Wildey a couple of times when we both lived in the same town in NW CT and attended a Congresscritter's town hall meeting. I believe he's still in that neck of the woods, but I have no idea if he's still producing guns. Here's his web site: