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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Are you shitting me? Voldemort can make a dragon out of his breath, fly around in the form of mist, and other crazy ****. Wizard magic also looks either instant or as fast as light. The guy has basically unlimited ammo and pin-point accuracy with magic that will INSTANTLY kill you. I'm not really sure what SWAT would do against him.