Massive Gun Failure... Not sure what to do
I went to the range today to sight in my red dot and everything went perfect for about 70+rds. Then the gun jammed. It has jammed like this before, but that was when it was completely dry, no oil or anything. But when it happened the other times I simply yanked on the bolt and the casing came out, that was with brass casings though. The ammo I was shooting today was steel cased. I can feel the tooth catching on the casing a little bit but if i pull any harder it slips off the casing. I tried pushing it out with a cleaning rod but it wont budge. And the back of the casing is marred up really bad, which is why it wont pull out when I pull the bolt back. I've tried using a cleaning rod, needle nosed pliers, wire cutters (to get in the groove), and various other ways of prying it out. Does anyone have any idea of how I could get this out? I've tried about everything I can think of. Also, do you know how I could prevent this in the future? And lubrication was not an issue, I cleaned and lubricated my gun very well just the night before. Thanks for any advice.
Also, this is an Ak47. Its a centurion 39 sporter to be exact.