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Emyr
gbj_tester
Let's consider that. If you could get 3W from your dynamo and wanted to fire 1 round per minute, the absolute maximum muzzle energy would be 180J, realistically well under half that. You need ~£100 worth of capacitors to store the energy.
22LR has a muzzle energy of around 180J, and it's about $7/100 at Walmart.