.50 Cal Blows Up and Injures Shooter

Rifle suffered a catastrophic failure and the bolt blew back out from the rifle and embedded itself in the mans neck area.

Thanks to user onepercent for posting a link that provides more details.
www.ar15.com/forums/t_1_5/1491243_.html
The forum post states the the shooter was shooting factory loads through the .50 caliber rifle (which was brand new) when the catastrophic failure occured.