What is your 30 cal version? You don't have mine, since I've only made one barrel and made the reamer myself, but there are others that are similar. BHW's 30 American is the closest.
I don't think I'd want to go through the trouble of bushing dies and the Valkyrie reamer + some other neck & throat reaming for this cartridge, but it'll be interesting to see what you come up with. The Herrett reamers and dies are available and just work, so it's really the simple way to go without compromising anything.
Don't try to use 223 magazines (or the 350 Legend mags) for this cartridge, you'll have endless headaches with feed issues because it's based on the 6.8 case not the 223. The larger 6.8 and Grendel cases both need their own magazines; they don't work right in 223 mags. 6.8 SPC mags are plentiful and it's not very much work to remove the ribs.
