Thread: Super Stuck 223 case - Advice wanted

So I managed to get another stuck case, no biggie I thought I've been here before. I drilled and tapped the case, got my washers and bolt and began to screw in the bolt to lever out the case. It was all going fine until the head of the bolt broke off

So I figured I would get some advice before I continue to make this worse. I did try to screw a nut on to what ever was let but the thread is a bit munted.
Let me know your thoughts,