I stumbled across a great new mag at the grocery store. It's called "The Complete AR Rifleman", It is everything AR!!! The issue I picked up has multiple reviews of 6.8's including the DD Ambush. Has article's on .338 specter, 458 socom, 6.5 Grendel, and many more calibers. It has a good mix of hunting and tactical focus to the articles.

Highly recommend picking up a copy. Good reading.

The current issue is called
Precision Hunting

Here is a link to their website.
http://www.tactical-life.com/online/news/the-complete-ar-rifleman-black-guns-hunting/?right=news