[Greywuuf]

I agree headspacing on the case mouth sux ( rifle or pistol) but.... if you wanted to do your own reamer, you could cut down .223 brass and have a substancial amount of "mouth" thickness to work with. This of course gives you a much thicker neck and the atendant problems, you would have to religiously trim your brass, and not inadvertantly 'bevel" them with your deburring tool. just consider it a AR in 45 acp (or 9mm) the nice thing is that straight cases lend themself to volume reloading on a progressive press.