Heavy duty 3/4" wrench and cheater bar = bent barrel, snapped receiver nose or twisted barrel.
Did you consider it may be silver soldered or pinned and welded or possibly LocTited? If it is fixed with Rocksett it will need to be soaked in water for a couple of days and then heated to break it loose.
Put a LITTLE heat to it, just enough to where it starts to smoke a little and give it a try. If it doesn't break loose STOP and give me a call.