You could reload for it. That would cut the price down. If you can get it for a good price, you would never loose any money on it.

Thats how I got my Ruger 416 Rem mag. A guy had ordered the Rigby version and when it came in, it was the Rem mag and the guy would not accept it as he had already bought all of his loading stuff for the Rigby. I was there when he turned it down and the store gave it to me at their cost. It didn't matter to me. Anything you hit with either of thse calibers would never feel the difference.