I found this on THR .
It appears that the primer did ignite and pushed the bullet just enough to engage the rifling but not enough to travel down the barrel significantly. The powder appears to be partially burnt as well. I can only imagine the outcome had the bullet traveled down the barrel, became stuck, and then I fired another round of full house .500 S&W Magnum !
Link ..... http://www.thehighroad.org//showthread.php?t=573569Moral of the story? Always, Always, Always check the gun after a misfire!
best,
Rp.