First and foremost, very glad you were not injured. Secondly, I would Weigh them all (rounds) that remaining in that box and give the manufacturer a call @ (208)-746-3668 with the data. Obviously you have uncharged rounds. I would make the assumption that the entire lot had issues that they are aware of and they would make it right. Scary stuff right there. Again, glad you were not injured.
David
David