I'd assume that bullets can travel a helluva lot faster than magic explosion stuff, and at a much quicker rate to.
A standard SWAT team would probably have been able to do the job more efficiently than Harry and his friends
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#Offtopic
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Yeah, that's what I always thought but it's too easy for JK Rowling to just have him block the bullets with some spell and then [i][b]Avada Kedavra[/b][/i] they asses.