Encore28,
My problem has been solved. I pulled the barrel off and sandwiched the hinge between two pieces of wood in my vice. That's all I needed was a little extra leverage. I slipped the socket wrench over it and it popped right loose with really not that much effort. The UGLY truch is that I had put it away last season without cleaning it. I had been throughly cleaning it after each time I had it out shooting it. For some reason I must have gotten distracted and thought I had cleaned it. Anyway, it had only been fired once before I put it away. That 777 sure cleans up just like they advertize! I put some hot soapy water in our laundry sink and ran a swab through it and everything just flushed right out in just a couple of swipes through. I don't think I'll ever make that mistake again .... famous last words ... huh? I think the last time I fired it was last Dec.
Good luck with yours. I'm going out to fire mine to see where it's shooting with the new 209ML primers I picked up. ML Season starts here the last Sat of Oct and runs for 9 days. I'm ready to go sit in my new box blind I just built :-)