Well, it looks like the mystery is solved. One of the forum members found this link showing another 50 BME rifle that sold back in 2017. The listing said it came with 2 sets of Hornady dies. I called Hornady and they confirmed that they made the dies. They said the caliber was
50 BRIGHT MOUNTAIN EXPRESS.
- 50 BME. They said they also made form dies that used the 338 Lapua case as the parent cartridge. Apparently shortened at the shoulder to 2.195" and opened to hold a .500 dia bullet. They said they could make me the same 50 BME loading dies for $265 with a 4 - 6 month delivery. I will wait to get the rifle in hand to confirm all this info.
https://www.rockislandauction.com/detail/1028/635/two-bolt-action-sporting-rifles
