Well guys, after chatting a bit with Bramble and ronvella, here is the new plan:

In the next little while I'm going to try and track down some .458 barrels, and a reamer for a 450 3 1/4". This rifle certainly isn't going to be the epitomy of a "safari" rifle, but my goals are to eventually have this thing firing loads carrying around 4000ft/lbs of energy. Certainly I could go higher, but I am unable to afford a trip to Africa these days, and on top of that, recoil just annoys me.

So I will keep everyone updated as I scrounge the necessary parts, and as things start coming together and work starts to get finished, I will be posting pics as well. Thanks for all the help so far, and keep the advice coming. Cheers -Cameron