I am a big fan of Magneto but until recently have been away from comics for a long long time (30 years), so please forgive me if this question has been answered before, but I've always wondered what Magneto would do if the cops, or anyone really, just used plastic bullets against him? I know this sort of cropped up in X Men Last stand, but that film wasn't the best, so what is the answer?
He probably has some loop hole against that with his powers but at the same time it is comics, so if someone tries that against him it will probably work. Kind of like how you're not supposed to be able to punch a green lantern but people do it all the time.
Magneto's powers are to do with electromagnetism not magnetism so chances are unless a writer is ignoring that or ignorant of that, Magneto should actually be able to affect even plastic bullets, that being said his powers naturally work best with metals. In some ways its better t think go Magneto as a telekinetic who finds metals much much easier to manipulate.
Also he can create some kind of forcefields
Desicription of the marvel wikia;
- Magnetic Force-Fields: Magneto usually protects himself with a personal force field that he can quickly expand to protect large areas. His force field has withstood the effects of multiple nuclear weapons, volcanic eruptions, the depths of space and attacks from multiple Avengers or X-Men. Magneto can also use his force fields to hit or trap an enemy, and also levitate objects and beings in the air.