It's high-proof. Superhumans might need a bit more, though. [Bucky is a regular, unpowered individual and it's strong enough for him, but someone like Steve or Thor wouldn't feel anything after a handful of shots.]
A fair few, from a couple different versions of the same world. [And he is one of those Avengers, but, while he's not exactly trying to keep a secret identity, he's still adverse to stating it outright.]
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A fair few, from a couple different versions of the same world. [And he is one of those Avengers, but, while he's not exactly trying to keep a secret identity, he's still adverse to stating it outright.]