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If you are firing the M134 minigun, it has a fire rate of 2000-6000 rounds per minute. It shoots 7.62x51mm NATO. The price per round could vary. If we assume it costs $0.70 a round and take a midpoint of 4000 rounds per minute, you are going to blow through 2000 rounds in 30 seconds. So for 30 seconds of fun it is going to cost you $1400.
Hardcore - We'll probably be modded for this... Come visit The Range http://www.gamefaqs.com/boards/1003-