By the time I got old enough to use a BB gun they were universally too powerful to shoot each other with. We found that you could take a small piece of tin foil and wad it up just enough to use as anti-personnel fodder.
One of the funniest things I ever heard was when I returned after an absence and was told about that if you bit down hard on them with your teeth they worked better. The quote was "we've perfected it...it hurts now."
CHAZ