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I'd imagine a nuke would still stun and blind Nanoha, much like a flash-bang and nukes are probably capable of seriously hurting or even killing the younger strikers.
Potterverse wizards could steal nukes, they wouldn't think of it, and probably not do it unless desperate, but they could.
Anything as primitive and innefective like an Ava Kedavra would just be handled by the layered shields of their armor. (There is an explanation in the manga I think about 4 different types of shields that are maintained by an Inteligent Device while transformed, and it's some impressive kit.)
Using a nuc to off any StrikerS cast would be the case of "if I can't win, kill everyone."
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Into terror!, Into valour!
Charge ahead! No! Never turn
Yes, it's into the fire we fly
And the devil will burn!
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