To Many, A Particularly Startling Element Of Alleged gunman James Holmes' planning was the size of his ammunition stockpile: he had purchased more than 6,000 rounds for his assault rifle, pistols and shotgun. Ammunition, it turns out, is a fast-growing business in the U.S. As of May, there were 1,996 licensed ammunition manufacturers-up 27% from 1,567 in January 2010, according a Bureau of Alcohol, Tobacco, Firearms and Explosives database.
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