So drill through the friggin bullet already, do it it a bucket of water to keep it cool, there won't be any heat or sparks to set it off. Dump the powder out, punch the bullet back into the case, the neck will then be free to compress (which will release the dies hold on the neck) then punch the whole thing out, it'll be free with little force. The whole problem is that the bullet has enlarged the case neck. It ain't rocket science.