Site sponsor P&D lists 300gr FTX Hornady ammo on their website.
I've owned a Performance Center S&W 500 for quite a few years now and have always reloaded for it. So because of this thread and wanting to help out a fellow member today was the first time I searched for 500S&W factory ammo. The only thing that came to my mind after I found some was YIKES!! As previously mentioned, you should get into reloading if you want to shoot this cartridge, even if just casually.