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?
Let me start by telling you the story of two Johns.
John number one went on a day hike with a couple of friends in the Cascade Mountains about an hour from Seattle. He somehow got separated from his buddies and became lost. John was dressed in casual cloths for a warm weather day hike and had nothing but a lunch with him. He spent three days in those mountains and luckily made it out to tell the story.
John number two, a friend of John number one, was much better prepared when...