Yep... if it's the same one I'm thinking of, it was an indoor (underground?) range in, I think, the UAE. The website was called something like Precision Reloading, IIRC...
They shot most of the really big rifles... they sort of "started" with the 458 Win Mag, and the 460 Weatherby, then went on to the 585 Nyati, and the 700 Nitro Express. They shot a LOT of different calibers. All of them LARGE.