Midway usually has just about everything you will need for ammo or reloading. Oddly in this case they do not list any brass but only loaded rounds at an average painful price of about $125 a box. They have everything else for reloading just no brass.
I just did a quick google search and everywhere shows dicontinued or backordered. I'm sure it's out there you just have to find the right supplier or check some auction sites for once fired brass.
That's a big gun. What are you planning to go hunt with it?
Wild boars are like many other (male) wild animals in that they will tangle over the affections of the fairer sex. Nature has however given them some additional padding over the fairer sex to prevent them from tearing each other to shreds. This bony cartiledge is most commonly referred to as the boar's shield. This armor helps prevent the tusks of mature males from penetrating into the vitals of their rivals (usually). I'd heard of such a thing before going on my first wild...