Good point. The Brenneke IS basically a 9.3 x 338. I think the 9.3mm rounds appeal to people because they work just as well as many other hunting rounds, with the added "coolness" of having something that isn't as common as, say, a .308 or .30-06. I posted a thread a while back about my Mauser build, showing how I made the brass for my 9.3, and it was just as painstaking as a full-on custom wildcat build. But, I enjoy it because it works perfectly and I get weird looks from people when I tell them what I'm shooting.
Here's the thread, for anyone interested:
http://www.canadiangunnutz.com/forum/showthread.php?t=418323&highlight=Brenneke
As far as arguing about the new king and how hunting rounds stack up against each other, I figure that if the hunter does his or her part, then they could be using a slingshot and still hunt effectively.
Erik.