While you are on the site, in your browser find and click "Add to Home Screen" A CGN beaver app icon will then be created to your phone that is directly link to the site.
Note: This feature may not be available in some browsers.
Most of the usual culprits, Buffalo Arms for dies and cases, M.T. Chambers for bullets, slug bore first as there were 2 diff. cases/bores, the newer chambering uses .458" std. bullets.
I don't know where you can buy it, but I made a couple of rounds to try from Starline 50-90 Sharps brass. I trimmed it to 2.100", annealed it and formed a neck with a 243 Win Seating Die. Mine slugs to 0.458".
A 400gr cast bullet over 32.0 grs of H4198 gave me a MV of 1400 fps.
It fireformed on the first firing and thereafter I just neck-sized with the 243 Seater die. Pressures are low enough that it will be many firings before the body needs to be sized.