460 weatherby, but I made some from the 500 weatherby being sold by Bertram. That was fewer steps. One annealing, one expansion, and one case trimming. The 460 weatherby is a bit more. The 550 magnum is awesome, but the 550 express I am going to us more for recreational shooting and bear hunting. I had 6 of the barreled up, but I already gave one to my friens son. He is shooting the heck out of it. That is why I needed more brass. I had a couple hundred pieces of formed brass before but keeping up with his shooting is challenging. He is shooting 2 or 3 times a week.
Ray H