Before going down to blow the bunker, turn the turret guns in Ramos' office against registered brotherhood personel. Makes it a lot easier, and you'll have a gauss rifle or two to fight out with.
Im afraid Ive finished with this game. Im not a massive gamer but even I could master Mafia 2 and RDR. Unfortunally New Vegas is just too hard and Im playing on very easy. Why is it that three head shots cant kill but one zap in my direction and Im dead. Its a great game but Ive got no way out of the bunker and there ends my quest.
Because that Zap gun is a billion times more powerful than that pea shooter you're using.