[NWPilgrim]

I think this explains it, from the Remington.com Safety web page:

Remington has determined that four (4) Lot Numbers of its .223 Remington 62 Gr Hollow Point (Match) Ammunition may have been improperly loaded.

http://remington.com/pages/news-and-...llowPoint.aspx

Since they say it is "improper loading" of the cartridges, I suspect the wrong powder or powder amount was loaded. Way over pressure somehow.