Mags, from what I've seen on other boards, are kind of hit or miss. ASC is making a dedicated 6 ARC mag so maybe that'll help. I guess until PRI or Barrett can make mags we'll continue to see issues. That's a guess, of course, but the PRI and Barrett mags have always worked well in 6.8.
I understand about not getting into the 6 without being a reloader. Even then nobody has brass and the dies aren't super common yet. Lee, Hornady and RCBS appear to be making them but finding them in stock is another issue.
Ideally I'll wait until someone like Midway has brass, dies, a barrel/bolt and mags in stock so I don't have to piecemeal or pay shipping from multiple sources.