Comment from the thread on the article:
http://www.freerepublic.com/focus/f-news/3261879/posts?page=31#31
According to the article, any rifle caliber that can be used in a handgun form (i.e. AR-15 handgun platform) will be banned. This would include 5.56, .223, and could possibly include larger calibers such as .308. Of course, the admin is keeping the specifics secret.
I have a Colt Trooper MK III in .357mag and a Henry Big Boy Lever Action chambered in .357mag... 158gr HP... so I guess that one’s going to be banned too. Well stocked on that item, too. FUBO!