While at the range testing a few loads on a Remington 700 308 i heard an unfamiliar report as smoke seeped out of the bolt area. Oh.. no,I thought as I attempted to extract the bolt. was it case separation? I could not break the bolt loose without a mallet so I left for home. After removing the scope and stock I was able to get better leverage and continued hammering on the bolt in an upward direction. when finally the bolt moved, I then continued to hammer it reward and it came out shell and all. As seen by the photo below it appears the case was melted into the bolt face. ( shell body badly beat up as I could not break it loose from the extractor with a pliers. Has anyone had this experience before and does anyone have any suggestions how to break the case free from the bolt face.