as others have said, PRVI makes the brass. Hornady makes loaded ammunition for it, but they use PRVI brass. I don't know that I've ever seen PRVI loaded ammo for 6.5x50. a couple side notes, out of a 30+ inch barrel, it performs extremely well, just shy of what most people see out of their 6.5 creedmores, but out of a carbine length barrel(roughly 20 inches), it is nearly identical to 6.5 Grendel, so it loses a ton of velocity. with that said, I love my little arisaka carbine, I got my first and only blackbear with it.