Depends. BB can create electromagnetic fields as well with his powers. Hell, he's contained multiple fist-sized black holes with said magnetic fields. Also, he has some decent control of his voice, he can attune it to a single person, or evev focus it for use in an enclosed, nearly indestructible room with others standing very close by. He stands a decent chance.
The only time I remember them meeting was an old Amazing Adventures or something from the 70s.. Magneto kidnapped Blackbolt and brainwashed him but I don't think they actually fought except for a few punches. Blackbolt did basically own the Mandarin in one of them though.
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this may be a battle we'll finally see go down. not sure about the power level mags will be wielding though as he's currently not as strong as he has been in the past.
assuming full strength for both of course....it's tough. damn, this would be close. be interesting to see mags' full shields against the voice. not sure which would win. minus the voice i THINK i'd take mags for a tiny majority. with the voice it depends if mags could shield or not.
this would be a fantastic battle. great bz material.
I'm not even sure why people think Magneto could just all willy nilly take control of BB's powers. When he can KO people like Gladiator or Hulk by whispering, a full scream would be a level of power hilariously above what Magneto usually tends to work with.
Am I saying he loses? Not necessarily, but I just don't think he's going to "lol nope I'm controlling it now!" BB's voice.
If I was Magneto I'd try to f*ck with the electrical impulses in BB's brain to prevent him from being able to do any severe damage.
__________________ Chicken Boo, what's the matter with you? You don't act like the other chickens do. You wear a disguise to look like human guys, but you're not a man you're a Chicken Boo.