I'd be happy to indirectly observe the BBs if that's the only way you can film them. Take a card board box, cut out as much of the sides as possible and replace them with plain paper held together by masking tape, leaving the box's corners alone for structural support. Rig a grenade to explode inside the box and film the BB impacts against the paper.
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"The Bird of Hermes is My Name, Eating My Wings to Make Me Tame."
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