pretty hard to find right now, but keep checking Raven Rocks they get it in when there are a lot of requests comes from Quality Cartridge its good brass. another thing if you load your own look for 458 Lott brass then trim it down to 2.5" . I am not 100% but I think you can load and fire form .338 win mag brass. till you find .458 brass, someone correct me if I am wrong