pinksushi1 you answer your self by defining the battle at full power. Magneto limit hasnt been defined yet. Because as few lucky characters have, his potential is limited by the force he represents. In his case unlimited.
Magneto does not depend only of magnetism to be offensive heck, I dont even think he will use metal pieces of buildings cars whatever to attack Vulcan, that will be a disrespect to Mags intelligence. What he can do is been defensive and by this way im sure that will drain Vulcan power or desperate him since theres nothing Vulcan can throw that Mags havent see it before, aside that; the disruptor force of Mags will desintegrate any offensive energy before reach him or he can let his great magnetic force field (the same defense that have resist a direct hit from Galactus and Phoenix) to absorb whatever Vulcan sent. He can block any particles of the enviroment he saw useful to Vulcan to stop canalize energy Also I dont think that Magneto would aloud that Vulcan mess with his magnetic force or his brain were are talking about someone who embodies the universal force itself someone that professor X cant control and Emma Frost cant mess with.
Magneto body naturally emanates magnetism thats why that force is the easiest to wield for him, but as electromagnetism refer that also means he can use the radiation that is the force range which is: visible light (that why he can be invisible by blocking the light from his body), radiowaves, microwaves infrared, ultraviolet, X-ray & gamma ray in a lesser extent but whatever way he want to use it. He can also charges his magnetic assaults with photonic energy that purple-pink sort of plasma energy that emantes from his hands not just magnetized metals.
Other thing is instead of emanate and throw the magnetic force he could eject inward so his body could be charged, so each cell each molecule of his body could mantain a permanente input ergo a permanet output along this he makes his body increase strenght in his muscles allowing to hit harder move faster react faster increase stamina and heal faster. So the ability of Vulcan of absorb energy Mags can use it to in a specific and higher way.
The Universal Forces are law, are infinite, exists everywhere and define the existence of reality.(Here in Marvel and DC)
Even that Vulcan absorbs and manipulate diferent forms of energy electromagnetism one of it, doesnt mean he wields that force at the same level as Magneto.
Magneto will deal with this raw-power mutant in a similar way as he did against Joseph. Suposely a younger more raw power in magnetism that Magneto. Mags have a highter level of dominance over the force which is different that raw wield and achieve victory alon with experience and tactics
Really I dont see the old man beat it by the lad in any way.
All I have stated is the default Magneto of our time I could think of some abilities that could be granted to him by oficial sources such writers or fans following the logic of being a potential.
Accepted or not facts define Magneto as a level Omega and he could have been long time ago a Cosmic Level(which surpass an Omega) If writers want to make the next logical step; that Magneto surpass his human limits because he has the potentiality factor. But this could also make that lost interest for fans since it is know that god-like characters it is less material to write for and his principal enemies the X-men Avengers will not oppose a decent treat and perfect beings do not get along with popularity.
Even in his default level MAGNETO oppose treat to cosmic level beings. Vulcan what