Okay, thanks. I guess it is irresponsible to try to circumvent the laws, but unfortunately they will not be changing anytime soon. Sometimes I curse my stupid fellow Californians.
I've spent the last hour or so researching my question online. It is prohibited for gun dealers to sell handguns to someone who is not a resident of the state they are in under the Gun Control Act (GCA) of 1968, with a few exemptions for those with an FFL. So much for getting my .50 DE. On a side note, a group who calls themselves Jews for the Preservation of Firearms Ownership claims that the original GCA introduced to congress was a translation of the Nazi-era National Weapons Law of Germany (called the Reichsgeletsblatt), and that the passed version keeps much of the meaning. Other sources seem to support this. Wow. I don't know German, but I might take up learning it just to see if this is true.