So did u have a case head seperation or just a bit of the lip? If the head and flash hole qre still attached a stuck case extractor will work perfectly. If its gonna take a while t get one try some wd-40 and let it sit upside down and screw in or out your decap pin and a shot in there. Place it back in the press and try and slide the shell holder on at another angle into the piston and head at the same time