Interesting. I tried this on Canada Day myself with a roll of expired Agfa Ultra 50 (50 ISO), and a 28mm lens (35mm camera).
Just for kicks I tried approx. 30 second exposures at f/8. That was too long, and in particular I got a lot of blow-outs due to the initial shell explosion. Also the 28mm lens was way too wide - something in the 50-90mm would have worked better.
I think in future the strategy of catching the bursts but not the initial explosion is a good one - I have an Agfa Clack that has a cable release thread, bulb mode, and no double-exposure prevention, so I might try that in future (although it might be a bit wide). I'm concerned that I'd disturb the camera using a hat or dark cloth/paper, but that should also work if you're careful.
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