Until you cut the case head yep, they make a puller for stuck cases. I have used (a few times) a 3/8 tap and a long 3/8 bolt and nut to pop them out. You drill the case head (remove the decaper first) tap it, use a spacer (such as a 1/2 deep 3/8 drive socket) put the nut and a washer on the bolt and run it all the way on. screw the bolt onto the case threw the socket, turn the nut and pop it out. But with no head to thread You might be in for a challenge.