Tbh, even without bfr Magneto can get pretty far, seeing as he has the entire Earth's supply of metal around him.
Hell, in NYC alone Magneto could take them all up to WB, between his flight, shields and the fact he has billions of tons of metal to accelerate at the Hulk at great speeds. I mean yeah Hulk will heal, but I'd say Magneto could put him down long enough to count as a win, especially with the given battlefield.